The suspect was identified as Dale Shoner, 43.
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He allegedly was the suspect seen on video attacking a random elderly man on a Hollywood sidewalk, using his backpack to hit him on the head and knock him to the ground.
That assault occurred Oct. 20 around 8 a.m. on North La Brea Avenue.
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Just about two hours after that assault, Los Angeles County sheriff's deputies based in West Hollywood arrested Shoner for a different alleged assault at Santa Monica Boulevard and Spalding Avenue.
The two agencies did not make the connection until after the Los Angeles Police Department put out a public release and surveillance video on the Hollywood incident on Wednesday.
Shoner is being held on $190,000 bail on charges that include robbery, criminal threats and assault with a deadly weapon.