Murdock was on the Titans' did not report list Saturday and coach Mike Munchak said the designation was for "personal reasons."
A former Middleton and South Carolina football player, Murdock spent last season on injured reserve with the Titans due to an Achilles injury. Murdock entered the NFL in August 2011 as an undrafted free agent with Tennessee.
Murdock had been with the Titans in the offseason to rehab from his injury.
He was discovered Monday morning at 8:30 a.m. in front of the high school, according to the Nashville Tennessean, and transported to Tampa General Hospital in critical condition.