Twenty-one years after his 16-year-old brother was killed, one man says he's on a mission to protect others from convicted murderers.

40-year-old Gary Thiede is being released Tuesday. The Neillsville Police Department says Thiede will live in Clark County.

Jayson Crow, Sr. from Jackson County says the thought of having his brother's murderer so close is tearing him apart. Crow was just eight years old when his brother died. To this day, he still has nightmares of finding his big brother's body.

"My godmother was at home putting my cousins to sleep when he was killed," Crow says.

Crow remembers every detail of the moment he found his brother shot; his throat slashed. At age 30, he still can't get the picture out of his head or the terror. It's all he can remember.

"I had a nervous breakdown. They said I have memory loss; I can't get rid of that memory," Crow says.

Robert Aponte died September 19, 1988. Gary Thiede was 19 at the time. He had been staying with Aponte’s family since the summer. Court documents show after killing Aponte in his Hatfield home, he stole guns and knives from the home. Investigators say he then robbed a bait shop and drove to Abbotsford. He was later arrested at a movie theater.

A couple months ago, Crow learned of Thiede's release. He's since collected 300 signatures. He wants Thiede and all people convicted of second degree murder kept behind bars. He does not want him one county away.

"It's got my family in a major uproar and scared," Crow says.

He says he's scared for his seven children. And for the family living in his old house. And for the community.

"My greatest fear is seeing on the news that he got a child into his car and knowing that what I was doing here with the petitions and everything failed," Crow says.

Thiede has also served prison time for third degree sexual assault and attempted enticement of a child. Officers say his criminal history shows he could have the potential to re-offend.

Crow says to this day he doesn't know why Thiede killed his brother. He plans to mail his petition to the governor Tuesday when Thiede is officially released.

The Wisconsin Department of Corrections will supervise Thiede until September, 2016.