Detectives in Charlotte are still trying to determine if the man charged with a robbery at Presbyterian Hospital was responsible for two other attacks in recent weeks.

 Detectives arrested Lejarris Williams late Tuesday after a woman said she was robbed at gunpoint in the parking lot of Presbyterian Orthopaedic Hospital.

 They spent much of Wednesday comparing evidence from that case with two other robberies at Presbyterian, including one where a woman was stabbed.

 “It looks the same to us.  We're certainly looking at in that vein and we'd love to close all those cases," said Captian Mike Smathers of the robbery unit.

 Williams was no stranger to police--they had arrested him nine months ago for allegedly robbing a Family Dollar store in east Charlotte

 But within weeks the case began to fall apart.

 Court records show that the clerk at the store had picked Williams out of a line-up.... but told police he couldn't be positive that he was the robber.

 The crime lab compared fingerprints from the scene and found they didn't match Williams'.

 So prosecutors dismissed the charge.

 Now on top of the work they're doing on the presbyterian cases detectives are looking again at the family dollar robbery to see if they can re-open that case.

 "We're doing that literally as we speak to either find evidence that will enhance the case or to meet with the DA to revisit the decisions that were made," Captain Smathers said.