27 Sep 2012 01:52 PM EST

-by Trista McKenzie, Contributing Writer; Image: Johnny Lewis at the 2011 Toronto International Film Festival (Image Source: Matt Carr / Getty)

Jonathan Kendrick “Johnny” Lewis of Sons of Anarchy was found dead in a driveway in the Los Feliz neighborhood of L.A. Wednesday after allegedly beating his 81-year-old landlady to death.

Police identified the body as Lewis, the 28-year-old actor who played Kip “Half-Sack” Epps on the FX motorcycle drama, according to People. Police were responding to reports of a 911 call about a screaming woman when his body was discovered.

Inside the building, police also found the body of Catherine Davis, who died of “blunt force trauma.” They also discovered the body of a cat that also appeared to have been beaten.

The officers were also told that Lewis was fighting with two men, though it is unclear if it was before or after the death of Davis.

“He appeared to have died from some type of fall, either from the stairway, or from the balcony, or from one of the roofs,” LAPD Commander Andrew Smith told KABC.

“It’s a terrible tragedy as far as we’re concerned, and we’re digging into the bottom of it,” Smith told People.

Detectives are not searching for any suspects and have concluded Lewis murdered Davis. While a motive is unclear, sources tell the L.A. Times that detectives believe Lewis may have been on a new drug called C2-I, or “smiles,” which causes hallucinogenic effects. According to the Drug Enforcement Administration, “smiles” is sold as tablets or powder and is eaten when mixed with chocolate.

Aside from Sons of Anarchy, Lewis also appeared on The O.C., Criminal Minds, Bones and CSI and briefly dated singer Katy Perry in 2006.