Baltimore police make 2nd arrest in man's beating, stripping April 24, 2012 -- Updated 0404 GMT (1204 HKT) Video of the March 18 attack was posted on the Internet Police are looking for two more suspects The victim was headed to his hotel room when he was attacked (CNN) -- Police in Baltimore have made a second arrest in a violent robbery that left a man battered and stripped of his clothes last month while onlookers laughed and did nothing to help. The beating on March 18 made national news after much of it was caught on video and posted on the Internet. The video also helped authorities identify suspects. On Monday, police said they arrested Shayona Davis, 20, for her involvement in the attack. Another 20-year-old, Aaron Parson, has already been charged with multiple counts of robbery, theft and reckless endangerment, police said. Authorities are looking for two more people, ages 18 and 21. According to a police report, the 31-year-old victim from Virginia was headed to his hotel from a downtown Baltimore club when he was attacked. However, the video fills in the blanks. In it, a man is seen standing unsteadily against a row of mailboxes near the city courthouse. Some people can be heard laughing, and no one comes to his aid.