The suspect in this week's shooting at a North Dallas financial services firm died this afternoon, police said.

Robert Mustard Jr.

Robert Mustard Jr., 60, died about 12:30 p.m. from a self-inflicted gunshot wound to the head. He was facing charges of aggravated assault in Monday's attack.

The shooting wounded a father and son whom Mustard had done business with at Smith Financial Group in the 12000 block of Merit Drive, not far from Medical City Dallas Hospital.

Police said he was a disgruntled client who was unhappy with the Smiths' services.

Richard Smith, 66, and Christopher Smith, 39, are expected to recover from their wounds. The elder Smith was shot four times in his legs, and his son was shot in the neck. Both were being treated at Parkland Memorial Hospital.

State records show that Mustard, an SMU law school graduate and a former Dallas assistant city attorney, received his attorney's license in 1979 but was later disbarred. He was arrested in 1986 for allegedly trying to bribe a Dallas warrant officer and marshal for access codes to a city computer so he could dismiss a client's traffic tickets.

Mustard's death will effectively close the assault case, and no charges will be filed, Dallas police Senior Cpl. Kevin Janse said.