Brian Loncar was found Dec. 4 in the front seat of his vehicle, which was parked in front of his downtown Dallas law office.
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The Dallas County medical examiner's office says the autopsy showed hypertension and hardening of the arteries were secondary factors in the 56-year-old lawyer's death.
Loncar's death came two days after the funeral for his 16-year-old daughter, who killed herself on Nov. 26. According to Grace Loncar's obituary, she had battled depression.
Brian Loncar was well-known in Texas for his television advertisements, in which he branded himself the "strong arm."
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Loncar's firm was based in Dallas, but his firm handled cases across the state.