PHOENIX (AZFamily) — A man is set to spend two decades behind bars for killing a Phoenix teen girl over 20 years ago.

On Friday, 39-year-old Sergio Francisco Reyes was sentenced to 20 years in prison for the murder of 15-year-old Elena Lasswell.

On the evening of July 10, 2004, Lasswell’s brother and his friends found the girl dead in her bedroom at a home near 23rd Avenue and Thomas Road . An autopsy revealed she died from strangulation and blunt force trauma to her head. The girl had also been sexually assaulted.

Witnesses reported seeing Lasswell and a teen boy between 16 and 19 go into her bedroom and shut the door the night before, July 9. That was the last time she was seen alive.

Police followed leads, but the case went cold for years.

Then, in 2012, Phoenix Police cold case

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