...Brian Spurlock-US PRESSWIRE Dec 21, 2008; St. Louis, MO, USA; San Francisco 49ers head coach Mike Singletary and 49ers offensive coordinator Mike Martz watch the action against the St. Louis Rams during the...

25 October 2009: Head coach Mike Singletary and quarterback Alex Smith #11 of the San Francisco 49ers on the sidelines against the Houston...

Texas Tech forward Mike Singletary (3) blocks TCU forward Kevin Butler (24) during the second half of an NCAA college basketball...

San Francisco 49ers head coach Mike Singletary, second from right, gives instruction to linebacker Patrick Willis, second from left, and other linebackers during...

San Francisco 49ers head coach Mike Singletary stands on the sidelne during an NFL football game against the Seattle Seahawks, Sunday, Dec. 6...

SAN FRANCISCO - NOVEMBER 08: Head coach Mike Singletary of the San Francisco 49ers looks on against the Tennessee Titans during an NFL game on...

HOUSTON - OCTOBER 25: Head coach Mike Singletary of the San Fancisco 49ers watches the game against the Houston Texans at Reliant Stadium on...

San Francisco 49ers coach Mike Singletary is seen at half time during NFL preseason football game against the Oakland Raiders in San...

SAN FRANCISCO, CA - OCTOBER 4: Head coach Mike Singletary of the San Francisco 49ers on the sideline during the NFL game against the St. Louis...

San Francisco 49ers wide receiver Michael Crabtree, right, smiles with head coach Mike Singletary, left, during an NFL football news conference at 49ers headquarters in Santa Clara, Calif., Wednesday, Oct...

San Francisco 49ers' head coach Mike Singletary stands on the sidelines during an NFL football game against the Minnesota Vikings, Sunday, Sept. 27...

MINNEAPOLIS - SEPTEMBER 27: Head coach Mike Singletary of the San Francisco 49ers talks to a referee during a game against the Minnesota Vikings...

Mike Singletary was one of the most respected players in the NFL. He remains as passionate as a...

...Oklahoma City, OK. 04 March 2009: Kansas' Cole Aldrich gets a rebound with Texas Tech's Mike Singletary reaching over his head during Texas Tech's 84-65 victory over Kansas at the United...

August 22, 2009; San Francisco, CA, USA; San Francisco 49ers head coach Mike Singletary watches from the sidelines during the third quarter against the Oakland Raiders at Candlestick Park. The...