Story highlights Police search an apartment leased by Aaron Hernandez

Acquaintance Carlos Ortiz told police about the place, search warrant says

Ammunition and a white sweatshirt are among the items taken from the apartment

Hernandez has pleaded not guilty to premeditated murder in Lloyd's June 17 killing

A search of an apartment leased by former New England Patriot Aaron Hernandez recovered ammunition from the same caliber gun used to kill his friend Odin Lloyd, court documents reveal.

Massachusetts State Police searched the apartment in Franklin on June 26.

Authorities found new evidence, including .45-caliber ammunition and a white hooded sweatshirt, search warrants obtained by CNN reveal.

The bullet that killed Lloyd was from a .45-caliber gun, and the white sweatshirt matches one Hernandez was seen wearing on surveillance video on June 17, the night Lloyd died.

Photos: Rise and fall of Aaron Hernandez Photos: Rise and fall of Aaron Hernandez Former NFL football player Aaron Hernandez attends his murder trial in Fall River, Massachusetts, on Thursday, January 29. The state accused Hernandez of orchestrating the shooting death of semi-pro player Odin Lloyd, the boyfriend of his fiancee's sister, in 2013. Hernandez pleaded not guilty to a charge of first-degree murder, but he was convicted on Wednesday, April 15, and sentenced to life in prison without the possibility of parole. Hide Caption 1 of 13 Photos: Rise and fall of Aaron Hernandez Hernandez is led into a Boston courtroom to be arraigned in May 2014. Evidence collected in Lloyd's death investigation led to two additional murder charges against Hernandez in a separate case in Boston. In that case, Hernandez is accused of shooting Daniel de Abreu and Safiro Furtado, allegedly over a spilled drink at a nightclub. The double shooting took place in July 2012, almost a year before Lloyd was killed. Hernandez, who pleaded not guilty, will be tried in that case after the Lloyd trial. Hide Caption 2 of 13 Photos: Rise and fall of Aaron Hernandez At a news conference in May 2014, Suffolk County District Attorney Dan Conley announces that Hernandez has been indicted for the July 2012 killings of Daniel de Abreu and Safiro Furtado. Hide Caption 3 of 13 Photos: Rise and fall of Aaron Hernandez Hernandez is brought into the Attleboro, Massachusetts, District Court for his arraignment on June 26, 2013. He was charged with first-degree murder in Lloyd's death. Hernandez was released by his NFL team, the New England Patriots, less than two hours after his arrest. Hide Caption 4 of 13 Photos: Rise and fall of Aaron Hernandez Hernandez catches a pass during Super Bowl XLVI on February 5, 2012. Hide Caption 5 of 13 Photos: Rise and fall of Aaron Hernandez Hernandez scores a 12-yard touchdown in the third quarter of Super Bowl XLVI. Hide Caption 6 of 13 Photos: Rise and fall of Aaron Hernandez Hernandez celebrates his Super Bowl touchdown. Hide Caption 7 of 13 Photos: Rise and fall of Aaron Hernandez Hernandez answers questions during Super Bowl Media Day on January 31, 2012. Hide Caption 8 of 13 Photos: Rise and fall of Aaron Hernandez Hernandez scores a touchdown against the Buffalo Bills on January 1, 2012. Hernandez played three seasons with the Patriots, catching 18 touchdowns. Hide Caption 9 of 13 Photos: Rise and fall of Aaron Hernandez Tattoos on Hernandez's arm are visible during a pregame warmup on December 4, 2011. Hide Caption 10 of 13 Photos: Rise and fall of Aaron Hernandez Hernandez looks up after being tackled during a game in Philadelphia on November 27, 2011. Hide Caption 11 of 13 Photos: Rise and fall of Aaron Hernandez Hernandez carries the ball as the Patriots play the Cincinnati Bengals in Foxborough, Massachusetts, on September 10, 2010. Hide Caption 12 of 13 Photos: Rise and fall of Aaron Hernandez Hernandez, center, reacts during the SEC Championship game between the Florida Gators and the Alabama Crimson Tide on December 6, 2008. Hernandez's Gators went on to win the national title. Hide Caption 13 of 13

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Hernandez has been charged with premeditated murder. He has pleaded not guilty.

Several other items were also found in the apartment, including a baseball cap similar to one Hernandez was reportedly seen wearing outside of a club the Friday before Lloyd was slain.

A valet ticket from the nearby W Boston hotel and several shirts with the number 81, Hernandez's jersey number, were also found.

Police found out about the apartment from the suspect's acquaintance, Carlos Ortiz.

He said, "Hernandez has a second place that not many people know about," search warrants show. He also told police that he and Hernandez stopped at the apartment the night after Lloyd's death, according to warrants.

Police then obtained a copy of the apartment lease, which was signed by Hernandez on May 1, search warrants show. The search warrants obtained by CNN are for Hernandez's apartment. The warrants for his home have not been released.

Authorities have said Hernandez and two other men picked Lloyd up from his Boston apartment early on June 17. Surveillance cameras captured the car at an industrial park near Hernandez's North Attleborough home. Lloyd's body was found in the industrial park later that day, authorities have said.

As Hernandez begins his second week at the Dartmouth House of Corrections, Bristol County Sheriff Tom Hodgson said Hernandez is adjusting to a lifestyle change that has taken him from deluxe accommodations and the adulation of fans to the solitude of a 7-by-10-foot jail cell.

Hernandez was "reclassified" this week, Hodgson said, meaning the pro football player was granted additional benefits, including three hours per day outside of his cell for making phone calls, walking around in a prison common area and an hour outdoors.

The former tight end will also be able to have an account at the prison's commissary, where Hodgson says he can order soup, cookies and toiletries. Hernandez can also see visitors one day per week for a total of one hour. No one has visited him yet, Hodgson said.

Hernandez, however, will still have no access to television, Internet or even a weight room. He will also be unable to marry his fiancee while in jail.

"That's for the other side of the wall," Hodgson said.

His next court appearance is scheduled for July 24.