Kirstie Alley believes she has found a common denominator of mass shooters in the US.
The Scientologist, 66, sent a series of tweets saying she believes psychiatric drugs are linked to most massacres.
Her comments came after Stephen Paddock, 64, shot and killed 59 people during a country music festival in Las Vegas.
"We have to solve the mystery of why there were no 'shooters' or almost 0 before the 1980s. I know one common denominator other than guns," Alley tweeted, suggesting Paddock opened fire due to his use of prescription drugs.