Cuttino Mobley, a Philadelphian who has played 11 seasons in the NBA, is expected to formally announce his retirement at a New York news conference today.

Speculation about Mobley's future has been swirling since he was traded from the Los Angeles Clippers to New York last month. Tests performed by the Knicks uncovered signs of hypertrophic cardiomyopathy, a source said.

That's the heart disorder that killed fellow Philadelphian Hank Gathers in 1990, the Celtics' Reggie Lewis three years later, and Atlanta's Jason Collier in 2005.

According to the source, Mobley's previous four teams knew the guard had a heart condition, but may have been unaware of its exact nature. He reportedly signed a waiver that freed each club from liability.

A graduate of Cardinal Dougherty High School and the University of Rhode Island, Mobley, 33, also played with Houston, Sacramento and Orlando.

He has not been on the court since being dealt to the Knicks in a Nov. 21 trade that included three players with Philadelphia connections. Mobley and ex-Villanova star Tim Thomas were sent to New York in exchange for Zach Randolph and Mardy Collins, a Temple product.

Despite their concerns about Mobley's health, the Knicks eventually approved the deal, making it easier for them to clear salary-cap space for an anticipated run at a 2010 free-agent class that is expected to include LeBron James.

Mobley has averaged 16 points a game in a 747-game career.