http://qui.live.mediaspanonlinen.com/rss/ Quincy Herald Whig en-us By RODNEY HART Herald-Whig Staff Writer A Quincy man pleaded guilty Wednesday to the drug-induced homicide of a high school senior last summer and faces up to 13 1/2 years in prison. As first reported Wednesday at www.whig.com, Caleb Walker, 20, pleaded guilty in connection with the August 2007 death of 17-year-old Shanea Jacobs. Authorities say Jacobs died of an overdose of MS Contin, a potent time-release form of morphine usually taken every 12 hours for chronic pain. http://qui.live.mediaspanonline.com/new_story/Walker-Pleads--THUR