Police identify suspect, motive in cardiologist murder Video

abcnews.go.com -

abcnews.go.com—Police believe Joseph Pappas, 62, ambushed and murdered Mark Hausknecht, the famed Houston cardiologist, possibly motivated by revenge for the death of his mother.

WATCH: Police identify suspect, motive in cardiologist murder. Police believe Joseph Pappas, 62, ambushed and murdered Mark Hausknecht, the famed Houston cardiologist, possibly motivated by revenge for the death of his mother.