Disturbing details emerge in 4-year-old's murder in Pennsylvania

The mother's boyfriend, Keith Lambing.

A 20-year-old Pennsylvania man is accused of murdering his girlfriend's 4-year-old son, and his mother is accused of helping him.

Keith Jordan Lambing, the boyfriend of the child's mother, is charged with homicide, rape and assault, the Pittsburgh Post-Gazette reported, as new details emerge about how the child was murdered.

The child was raped, severely burned on his left hand and bruised around his body before he died, according to the Post-Gazette.

Goldinger told Pittsburgh's Action News 4 he may decide to seek the death penalty after Lambing has his preliminary hearing.

Lambing's mother, Kristen Herold, is charged with hindering apprehension and child endangerment for her alleged involvement in the case, Butler Township Police said in a statement.

A tip led police to an abandoned home in Butler, Penn. where they found Lambing and Herold, who they arrested and took to Butler County Prison, Butler Township Police said. They had warrants for their arrest unrelated to the child's death, Police Lt. Matthew Pearson told Fox News. Keith Lambing didn't show up to a burglary hearing the day before the 4-year-old died.

The boy had been staying at the Super 8 motel in Butler with his mother, Lambing and a baby.

The child’s mother was at work when the 4-year-old needed medical attention, Goldinger said. Lambing called Herold for help. She came and picked up the boy but the child became unresponsive in the car. Herold called 911 for help and pulled into a parking lot. Paramedics came to the scene, performed CPR on the unresponsive child and took him to Butler Memorial Hospital where he died Tuesday, Goldinger said.

The baby, who was also staying at the motel, is no longer under the mother's custody, Goldinger added. Youth services took the baby under protective custody.

The 4-year-old's mother, McKenzie Peters, may also be charged for playing a role the murder, Pittsburgh's Action News 4 reported.