Tony Martin, retired boxer, fatally shot in altercation in Philadelphia

(CBS/AP) PHILADELPHIA - Family members say retired boxer Tony Martin was fatally shot in an altercation with a visitor at one of his rental properties in Philadelphia.

Police say the 52-year-old Martin, a former welterweight, was shot during an argument at the home in the city's Hunting Park section on Friday. Martin's niece, Robyn Peete, says that her uncle was a good landlord and longtime postal worker and that the altercation apparently involved a person visiting his tenant.

According to Philly.com, Peete says Martin was at the property to collect rent from his tenants.

Martin's family is pleading for the gunman to come forward.

Martin was 34-6-1 in his boxing career, with 12 knockouts. He is a native of St. Louis who moved to Philadelphia to train in 1985. He lost his last fight, a decision to Julio Cesar Chavez in Las Vegas, in 1997.