Baton Rouge shooter dead, identified as Gavin Eugene Long

Police have identified a single perpetrator of Sunday's attack on police in Baton Rouge which left three officers dead and several more wounded.

Gavin Eugene Long, age 29, of Kansas City, Missouri, was killed Sunday morning in a shootout with officers. It was his birthday. Law enforcement originally believed there may have been additional shooters at large.

A military source told CBS News Long was honorably discharged from the Marines in 2010, and a spokesman for the University of Alabama confirmed he attended the college for a semester in 2012. He also was active online, running a website called "Convos with Cosmo," where he claimed to be a "freedom strategist, mental game coach, nutritionist, author, and spiritual adviser," NBC News reports.

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This post has been updated throughout.