WATERVILLE — A key witness in the trial of a man convicted of burning down a Vassalboro coffee shop that employed topless servers is now facing his own legal troubles.

Police say 26-year-old Thomas Mulkern of Gardiner was arrested Tuesday and charged with stealing money from a home and fleeing from police. He was arrested wearing hospital scrubs because he had been admitted to a hospital the previous night on suspicion of being under the influence of the drug known as bath salts.

Police tell the Morning Sentinel officers needed to use a stun gun to subdue Mulkern, who was combative during his arrest.

Mulkern was a key prosecution witness during the two week trial of Raymond Bellavance Jr., convicted last week of arson in the June 2009 coffee shop fire.