Columbia Police arrested a man Thursday on suspicion of a Jan. 4 robbery.
A 60-year-old man was robbed at knifepoint in the area of Melbourne Street and Richardson Street after he believed the man was going to help him carry some groceries, according to Sgt. Stephen Monticelli.
The victim identified Glen E. Lewis as the robber.
Lewis was already in custody on suspicion of robbing a 74-year-old woman of her purse in the 1600 block of Paris Road on Wednesday morning.
Lewis was arrested on suspicion of robbery in the first degree and suspected armed criminal action, police said.