Man beaten to death in front of crowd at Amtrak station in San Antonio

Immediately after pummeling a man to death last week during what appeared to be an unprovoked attack at an Amtrak station east of downtown, Michael Joseph Fobbs Jr.'s demeanor seemed to change, witnesses said.
He went from angry to “calm and detached” as he retrieved a new shirt from his luggage and changed out of his blood-covered garments in the station's bathroom, witnesses told police.
Fobbs, 21, was charged Thursday with murder. He remained at Bexar County Jail Monday in lieu of $150,000 bail.
Two passengers waiting for the next train told police they saw Fobbs, of Cibolo, pacing back and forth angrily just before 11 p.m. Thursday.
The witnesses reported Fobbs gave them “an angry look” several times, prompting one to ask Fobbs if there was a problem. Fobbs walked away and then entered and exited the waiting area several times, still apparently angry, the witnesses told police.
When he went outside the third time, he started pummeling a man, 56, who had been sitting on a bench, according to police.
A witness said the man on the bench “was just sitting there” when Fobbs began punching him. Authorities have not yet released his identity, pending notification of next of kin.
San Antonio police officers arrived and reported Fobbs was “very calm and was cooperative,