http://www.msn.com/en-us/news/us/mateen-altered-looks-researched-anti-psychotic-drugs-before-attack-acquaintance/ar-AAhtXij?ocid=spartanntpOn the morning before the massacre at Orlando's Pulse gay nightclub, shooter Omar Mateen drastically altered his appearance, shaving his head and face, and seemed agitated and surly, said an acquaintance who saw him that day.
Mateen also talked about staying up all night to do online research into anti-psychosis medication, the acquaintance said in a interview. The acquaintance requested anonymity, saying authorities had asked him to keep quiet.
The 29-year-old gunman, who killed 49 people and wounded 53 in the deadliest mass shooting in modern U.S. history, called himself an "Islamic soldier" and pledged allegiance to the Islamic State militant group before being fatally shot by police after a three-hour siege.
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