12/07/2012 08:01 am ET Updated Dec 07, 2012

'Very Bad Men': Man Forged Nurse's Exam, May Have Killed Hundreds Of Elderly Patients (VIDEO)

"Very Bad Men" explored the story of Orville Lynn Majors, a man who had forged his nurse’s exam to work in an Indiana hospital. Once there, he began killing elderly patients staying in the ICU.

Majors killed them by increasing potassium levels in their IVs, causing the to have heart attacks. Staff noticed the number of deaths in the hospital increasing drastically, and eventually caught him.

Majors was convicted on six murders and is serving 360 years in prison. Yearly deaths at the hospital quadrupled when he was there, leading authorities to suspect he could’ve killed more than 100 people.

Investigators think he even consoled victims' families after they’d died in a sick display of power. Majors was one of the hospital’s most popular nurses among elderly patients, who said he was tender and kind.

See more true stories of "Very Bad Men" every Thursday at 10 p.m. EST on ID.

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