Investigators are still searching for a motive in the Saturday shooting of former President Donald Trump at a rally in Pennsylvania. Part of that investigation involves looking at the family of the shooter, Thomas Matthew Crooks.

The New York Post talked to a neighbor of Crooks's older sister, Katie Crooks, who lives in an apartment in Bethel Park that her brother apparently helped her move into three years ago.

“The person who helped her, I couldn’t tell if it was a male or a female,” the neighbor said about Thomas, now 20.

“A couple of days later, I asked if it was one of her siblings and she said it was her brother. The one who shot Trump … He was real scrawny,” he added.

"Go-getter"

The neighbor characterized Katie Crooks as a "real go-getter" who worked as a janitor at the local high school and also as a server at a restaurant nearby.

“She’s real friendly,” he said. “She’s a nice girl. I couldn’t say a bad word about her.”

He didn't have much information about the man who shot Trump, however.

Investigators have found out that both Crooks and his sister are registered Republicans and their father Matthew Brian Crooks is a Libertarian.

Crooks's history

Thomas Crooks recently graduated from Community College of Allegheny County in Pittsburgh in May with a major in engineering science.

The community college said in a statement, “Like all Americans, we are shocked and saddened by the horrific turn of events that took place in Butler, Pa., on Saturday."

“We are grateful that former President Trump is safe and recovering, and we extend our condolences to the family of Corey Comperatore on their loss, and offer our thoughts and prayers to all others who have been impacted by this tragedy,” the statement continued.

He was set to go to Robert Morris University near Pittsburgh in the fall.

“Our hearts go out to former President Trump, the family of Mr. Corey Comperatore, and anyone physically or emotionally harmed by this tragic event,” university officials said.

“We stand against violence in all its forms and are committed to fostering a safe and supportive community for all.”