Michael Davis, the man charged with the murder of a tourist in Petworth and thought to be linked to a number of other hammer attacks in the neighborhood, was ruled incompetent to stand trial today, reports NBC4.

Davis, the 19-year-old brother of two NFL stars, was charged this week with the murder of Colorado tourist Gary Dederichs, who had been staying in Petworth during a two-week-long visit to the city. He was also charged in the assault of a woman in the neighborhood, and is thought to be responsible for at least three other related attacks.

According to the Washington Times, Davis had a history of mental problems, including a 2011 claim of schizophrenia. Witnesses have said that he was looking to get a gun before the attacks.

His next hearing is in July.