SAN DIEGO (CBS 8) - The man who admitted causing the death of a San Diego State nursing student is about to go free.

John Steven Burgess is due to be released from a Los Angeles County jail next Wednesday after serving half of a five-year sentence for his role in the disappearance of 19-year-old Donna Jou.

Lisa Jou says family members will be watching Burgess very carefully to see if he returns to the exact spot where he put her sister's body in the summer of 2007.

She's still not sure what exactly happened to her sister in June 2001, but she says the man linked to her disappearance and death is getting away with a legal slap on the wrist.

"You know part of me wants to be angry and wants to focus on the injustice of the situation, but another part of me hopes that he's come to Jesus in this time," Lisa Jou said.

The 41-year-old is being released from L.A. County Jail next Wednesday after serving half of a five-year sentence for involuntary manslaughter and concealing the body of the 19-year-old SDSU honors student.

"Most criminal masterminds could not get away with this and have it work out so well," Lisa Jou said.

Burgess, a convicted sex offender, told investigators that Jou attended a party at his West Los Angeles home in June 2007. He says he gave her drugs and alcohol, and found her dead body sitting in a chair the next day. He says he freaked out, took her body to his sailboat and dumped her in the ocean.

"I don't believe his story, I don't think anyone has a reason to conceal a dead body unless they're trying to hide something, not an accidental death. I'm just not buying it, and I'm still not going to buy it and I'll never buy it," Lisa Jou said.

Over the years, authorities have looked at several leads, but none of them have ever helped them find Donna Jou's remains. The L.A. District Attorney's Office has closed the investigation. But there is still a $15,000 reward for any credible information about the case.

Lisa Jou says it would take a miracle for John Burgess to tell police what really happened to her sister.

"Still utter disbelief that this guy, who's clearly not the sharpest tool in the shed, got away with disposing a body in broad daylight. Not a shred of physical evidence, a shred. Insanely difficult," she said.

Donna Jou's parents will be holding a press conference next Wednesday morning at the Los Angeles County Central Jail when Burgess is released.