Nearly two years after a Colorado teen's controversial death, an investigation has concluded that she did in fact commit suicide.

The parents of Holly Moore, who died just a week after her 19th birthday, maintain that she was murdered, and hired professional private investigators to examine further.

It was revealed on Friday that the Colorado Bureau of Investigation agreed with the original autopsy, believing that Holly hung herself in her closet.

Nearly two years after a Colorado teen's controversial death, an investigation has concluded that she did in fact commit suicide

Her mother and father, Ray and Shelly, of Castle Rock, Colorado, told Denver Channel that it didn't make any sense that Holly would commit suicide.

Her friends and ex-boyfriend, however, painted a different picture - saying that they'd noticed Holly with fresh self-inflicted cut wounds and even once caught her writing a suicide note. She was discovered with the names of several people written on her body, including her sister April and ex-boyfriend.

Her ex-boyfriend was a suspect in her death, after friends and family reported that their relationship was at times violent. They claim he choked her on more than one occasion and threatened to kill her. He was never arrested or charged.

Her sister April and father Ray both maintain that she was murdered, and hired professional private investigators to examine further

Handwriting specialists brought in by the family believed that the names on her leg were written by two different people.

The family's independent investigative team raised a number of concerns with the original decision from the medical examiner who determined her death.

They've asserted that the Douglas County Coroner Jill Romann was not a licensed medical doctor, and they found her claims unreliable.

She was discovered with the names of several people written on her body, including her sister April and ex-boyfriend

The family also believe that police botched the crime scene and failed to collect proper evidence. Their theory is that Holly was murdered and her body was staged to look like a suicide.

Holly's father Ray was one of the last to see her alive when the two had ice cream that night. He claims that he received text messages from the person he believes killed her.

'Then there's a few messages that get sent out that are bad grammar and bad spelling – unlike Holly,' Ray said told Denver Channel.

'Then there's another 15-minute break, a couple of more messages, a 20-minute break, and then the last one that shows a picture of her leg with the handwriting on it.'

Holly's mother Shelly has since passed away due to complications from MS. When Holly was alive, she was a full-time caretaker for her mother.

However, it was James A. Wilkerson IV, M.D., who conducted the autopsy on Holly the day after she passed, and he ruled her death a suicide. He is the chief coroner at Larimer County, but was working in Douglas County that day.

The family also pointed to some aspects of the crime scene that they felt made her death suspicious. X-rays showed that Holly had a broken collar bone post-mortem, her hand was found tangled in the cord used to hang herself, and the way the cord was fashioned was not consistent with a hanging suicide.

The private investigators hired by the family, Drs Richard and Selma Eikelenboom-Schieveld, have both had substantial experience working in forensic science, including the cases of Jon Benet-Ramsey and Peggy Hettrick.

As was the case for Hettrick, they believe they could overturn the authorities' decision based off of DNA evidence. They collected a number of swabs from the scene which they are encouraging the family to have processed.

The DNA testing, however, costs a significant amount of money, and the family has tried to raise it by selling their house.

X-rays showed that Holly had a broken collar bone post-mortem, which Wilkerson said was due to his autopsy

Wilkerson said that it's important to take all of the aspects of the case into account, but that the evidence in his opinion still pointed to a self-inflicted death.

He said: 'What do I have to gain by calling this a suicide if it's not a suicide?

'I mean, I'm looking for the truth, and if somebody did this, then I'm looking to get [the family] justice. But I think that Holly did it herself, and it's a tragedy.'

Wilkerson said that it was his responsibility that Holly's collarbone was broken - as is a typical procedure when conducting an autopsy. Medical examiners cut through the bone during the process, as well as the ribs and clavicles.

As the cord was wrapped around her neck several times, he said it was likely that her hand got caught beneath the cord by accident. He also found no signs of a struggle.

'It tells us that she wasn't beaten, she wasn't subdued, she wasn't manually strangled,' he said.

'There weren't any marks on her neck that would indicate that she tried to pull the cords off while somebody else was holding them there.'

The family, however, still believes that Holly's death was a homicide and plan to file a wrongful death suit. Their group, 'Justice for Holly Moore' will hold a march on Sunday to commemorate the two-year anniversary of her death

There were also parts of her body that were touching the floor when she was found. This indicated to examiners that the action was intentional, as she could have stood up to relieve pressure from her neck if she wanted to.

Wilkerson said said he was open to the interpretation of new evidence if it was compelling, but that for him it was a 'pretty clear cut suicide'.

The family, however, still believes that Holly's death was a homicide and plan to file a wrongful death suit. Their group, 'Justice for Holly Moore' will hold a march on Sunday to commemorate the two-year anniversary of her death.