A SERIAL killer told Sir Trevor McDonald he slaughtered dozens more people without cops finding out.

William Clyde Gibson, from South Indiana, is on death row for murdering three women in cold blood.

6 Serial killer William Clyde Gibson laughs when asked if he has humanity Credit: ITV

In the latest series of ITV's Crime and Punishment, presenter Trevor McDonald confronts Gibson about the killings in prison.

When the broadcasting legend askes him about the extent of his crimes, Gibson says: "They [police] might have a tenth of it, I'll put it that way."

Sir Trev pushes the killer on the exact number of victims, saying: "'What, around 29 or 30?"

The proud killer says: "yep".

When asked why he killed his first victim, Karen Hodella, he said simply: "I just felt like it."

6 Gibson is led into cell with McDonald in handcuffs Credit: ITV

6 Sir Trevor McDonald pressed the killer on how many he killed Credit: ITV

"I didn't have to have a reason."

Gibson killed Karen Hodella, 44, who he had never met in 2002. Her body was found near the Ohio River in Clarksville.

His second victim was his mother's friend, 75-year-old Christine Whitis.

Her body was discovered in Gibson’s New Albany garage days before another of Gibson's victims was found buried in his garden.

He told McDonald: "She caught me cutting up another woman. She said was going to call the police. I strangled her."

6 Gibson strangled his late mother's friend Christine Whitis, 75, in April 2012

6 He molested and killed Stephanie Kirk, 35, in March 2012

He admitted killing Stephanie Kirk, 35, on March 25, 2012 - and had mutilated and sexually molested his last two victims.

When McDonald questioned his humanity, Gibson says: "I don't believe I've got any humanity. It just doesn't seem to affect me.

"I could kill a person and then just go out for dinner.

He was sentenced to death in June 2014.

6 Karen Hodella, 44, was stabbed to death in 2002

Gibson even told Trevor he got an "adrenaline rush" out of murder.

He added: "I got a kick out of cutting them up. Seem like after the first one it just got good to me.

"At first I was kind of nervous about it, but then after the first one… It wasn’t just women, there were men too.

"They just didn’t find them, I didn’t say anything about them."

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Laughing, he adds: "I don't care."

Gibson was sentenced to death in June 2014.

Crime and Punishment returns to ITV with Trevor McDonald tonight at 9pm.