A man accused of firing shots in a downtown Houston park was found incompetent to stand trial on Monday.

Joshua Anthony Twohig, 21, has been charged with aggravated assault against a public servant.

Houston police said Twohig was seen firing shots in Tranquility Park on Rusk Street about 5:10 p.m. Nov. 21.

Witnesses said the shooter claimed he was the "White Knight," talked about police corruption and fired away.

Investigators said two bicycle patrol officers flagged down by witnesses told Twohig to drop the weapon, but he fired shots into the pond and then pointed it at his head. Detectives said he then started screaming, "Shoot me. Shoot me."

Officers once again told Twohig to drop the weapon, but he made hostile moves toward them, investigators said.

Detectives said the officers shot Twohig and fell down to the ground. Twohig stood up again and reached for his rifle, and the officers shot him again, police said.

Twohig's wounds were not life-threatening.

Three U.S. deputy marshals arrived moments later and helped take Twohig into custody.

Twohig has been sent to a mental health facility. His lawyer, George Parnham, said Twohig is severely mentally ill and never wanted to hurt anyone but himself.

"He was delusional, exhibited paranoia," Parnham said.

Parnham also said diaries found with Twohig on the day of the shooting, along with other items in his home, show his client felt there was some type of massive conspiracy bearing down on him.