Update (1/13/2016): Lawrence Phillips was found dead on Wednesday, a California Department of Corrections and Rehabilitation spokeswoman confirmed to USA TODAY Sports.

The handwritten letters have arrived with the same return address: Lawrence Phillips G-31982, Kern Valley State Prison, P.O. Box 5101, Delano, CA 93216.

Yes, that Lawrence Phillips.

The star running back on University of Nebraska’s national championship teams in 1994 and 1995. A first-round pick, sixth overall, in the 1996 NFL draft. A convicted felon — sentenced to 31 years for driving his car into three teenagers and assaulting an ex-girlfriend — under suspicion for the recent death of his cellmate in a maximum-security prison 140 miles north of Los Angeles.

Authorities have said little about the investigation since finding the body of Damien Soward, a former gang member serving 82 years to life for first-degree murder, unresponsive in his cell on April 11. That same day, a second inmate was named as a suspect in the death of his cellmate in the prison designed to hold fewer than 2,500 inmates but that currently houses more than 3,700 inmates, a prison spokesman said.

Phillips, 40, appealing his sentence, has made no public comment outside of the courtroom in more than a decade. But USA TODAY Sports obtained copies of letters he has written over the past 18 months that offer insight into his state of mind and situation.

He wrote several of the letters to Tony Zane, who coached Phillips at Baldwin Park High School in Southern California. Phillips transferred to the school before his junior year, and Zane recalled starting him at wide receiver, rather than running back, in the season opener. “Shows you what I know,” Zane said with a chuckle.

Zane moved Phillips to running back that next game, and Phillips helped transform Baldwin Park into a powerhouse as the coach and player developed a strong and lasting relationship. Zane said he has regularly sent Phillips care packages that have included everything from a TV to gym shorts to snacks.

Here are Phillips’ letters to Zane and other coaches. (They have been edited for length and clarity.)

JAN. 14, 2014

Dear Coach Zane, How are you doing? I’m doing well. As you might have noticed on the envelope, I have been moved from the cell I was in. I spent some days in the hole for refusing to room with a gang member. They have now took my privileges, which include yard (exercise), canteen, vendor packages, and all personal property for 180 days. I will of course appeal this decision as I was refusing to room with gang members after already having had incidents with gang members. At any rate, I just wanted to write to you and let you know in case that the package I requested was returned. I have not received any mail since moving, so I do not know if you sent the package. They are supposed to re-route mail, but they usually don’t check and make sure they guy in the cell is the correct guy to receive the mail. At any rate, I will appeal the situation and I should get relief due to my several incidents involving gang members. We are on lock down at this time due to a murder and the stabbing of five other dudes. I hope you and your family are well and had a Merry Christmas and Happy New Year.

Several letters have been written to Ty Pagone, a retired vice principal and former football coach at Baldwin Park High. Phillips was living at a boys home when he transferred to Baldwin Park and Pagone helped Phillips get on track academically so Phillips would be eligible to accept college scholarships. Phillips and Pagone, a close friend of Zane, also developed a close relationship.

MAY 29, 2014

Dear Coach Pagone, We are still today on lock down due to some stabbings and assaults between black and white inmates. It has been ongoing for sometime. I am glad to hear Marie’s wedding was great. Usually an open bar leads to a lot of dancing. I do not have a cell mate. All of these dudes want to use drugs and (illegible) weapons in the cell. I’m in the process of applying for single-cell status. I will let you know how that goes.

JUNE 15, 2014

Dear Coach Pagone, I received your letter and package a day apart. We do get the packages in lock down as the companies do not really want the items back. We have been in lock down about 80% of the time. You would be surprised at what these altercations are about! Nonsense! But when your world is this small all one has to care about is nonsense. That is why I do not want any of these idiots in the cell with me. All they they want to do is the drugs, make knives and make alcohol. Then they say when they get out they will not come back. I tell them of course you will. You are doing the same thing that got you locked up. Of course they do not want to hear that. It is like speaking to a brick wall. Now I understand how people must have felt talking to me. So needless to say I have zero friends inside here. Not one person is in line with my way of thinking. Well that’s all from here, Pagone. I will stay out of trouble. I might have to endure some write-ups for refusing a cell mate though. Better that than them getting me into serious trouble.

JULY 6, 2014

Dear Coach Zane, I hear you were in Hawaii. I am sure you had a good time. Remember when we went out there and kicked their butt in the all-star game and they tried to hold up our bus and all that crap? Good times. Well there is not much happening here. We are still on lock down because they found a hacksaw in someone’s cell. Apparently people use the saw to cut up the bunks and make knives. It is completely nuts in here. It is pretty much a free for all.

SEPT. 14, 2014

Dear Coach D, Huskers kicked butt out there. I only listened to the radio. The game was not televised here. (Nebraska running back Ameer Abdullah) has a real chance at the Heisman and the Huskers could win the Big 10, although the Big 10 is a bit watered down with the injury to O-State Q.B. (Braxton Miller). NFL is going through some stuff. Unfair to blame the NFL for what guys do. … These misdeeds by the players (are) being used by the liberal parties and the media to further their particular interests. Next they will be forcing out owners like they did with the Los Angeles Clippers owner (Donald Sterling). Well, there is nothing new happening here. We are still locked down. One of the guards was assaulted so it may be awhile. Coach D, this place is a jungle. Trouble everywhere. One must swallow his pride constantly or one will always be in the hole. But we must deal with the situation we put ourselves in.

APRIL 9, 2015

Dear Coach Pagone, I was able to get the necessary paper to prove that the court had made a mistake in closing my case in appeal. I was not informed of the ruling by the court and could not have responded in time. When I refer to prison lawyers, I am referring to guys who have been incarcerated for 20-30 years and have been in the courts for most of those years. They pretty much have a top notch legal education. Once you have been out of the hole for a certain amount of time you are cleared for a lower security prison. I have been cleared but I have not been moved. There are many people in this same boat. They say it is due to the overcrowding. On the Level IV yards, which is the highest level, not many people go home. Most have life or 30-40-50 years and in some cases 350 years. So not much new space opens. Hopefully my time will come soon.

Three days after sending this letter to Pagone, the California Department of Corrections and Rehabilitation, announced Phillips was a suspect in the death of his cellmate.

MAY 3, 2015