MONCKS CORNER — The former girlfriend of a man charged with killing his young son and then putting the body in a trash can filled with concrete testified he wiped the victim with peroxide to get rid of fingerprints.

Grace Trotman also testified Tuesday that Roger Anthony Williams often hit 2-year-old Rodricus Williams and showed little emotion when the child died.

“He said he didn’t know how to feel because he had no feelings for him,” Trotman testified Tuesday in Williams’ Berkeley County trial on a charge of homicide by child abuse.

Authorities said the child died of a blow to the head and that Williams, 31, of Summerville, and Trotman concocted a story that the child had fallen into the water off Charleston’s Battery on July 6, 2010. Rescue crews searched the water but turned up nothing.

Authorities said that two days later, Trotman led police to the child’s body in the community of Bowman in Orangeburg County.

Trotman, who has pleaded guilty to two charges, is cooperating with authorities and will be sentenced after Williams’ trial.

Trotman testified she lived a life of fear, abuse and pain when she lived with Williams. She said she became pregnant and Trotman beat her during the pregnancy. She also testified that Williams hit Rodricus when he would “stand like a girl.”

She said on June 7, 2010, Trotman’s daughter and Rodricus were fighting at the home, so she “popped him” and he lost his balance, hitting his head on the wall. She said she laid the child down and did CPR and called Williams at work who, she said, told her not to call 911.

When Williams returned from work about 20 minutes later, the child was dead, she testified.

Later, she said, Williams wrapped the body in trash bags and tape after wiping it with peroxide. She said he stuffed him in the trash can and covered him with the cement.

She testified the couple then rented a truck and dumped the trash can behind a trailer in Bowman.