A man who police say claimed he killed at least a dozen people around the country during three decades of hopping trains has been convicted of capital murder in Virginia.

Michael Elijah Adams entered an Alford plea Wednesday in Henrico County Circuit Court. The plea means he does not admit guilt but acknowledges prosecutors have enough evidence to convict him.

Media outlets report that the 49-year-old Adams, who went by the nickname "Dirty Mike," was sentenced to life without parole as part of a plea agreement. The conviction was for the 2006 slaying of Robert Allen Chasserau in the Acca railroad yard just north of Richmond.

Adams already was serving 15 years to life for another murder in California. He will finish that prison term in Virginia.