Crime: Robbery.
Investigation:
When we arrived at the scene there were six pieces of evidence (a wallet, a beaker with a fingerprint, a ransom note, blood, and two types of hair) and eight possible suspects. We identified the wallet found at the scene as Mike Kelly's suggesting he was either robbed or was involved in the crime. There was a beaker next to the wallet with a ulnar loop like Mike Kelly's fingerprints. We checked his records and found he's an educator. Also there was a ransom 
note in an envelope that read "I have your diamond ring". The hand writing matched Ralph Nelson's hand writing. With this new information we could rule out Mike as a suspect. Next we found blood near the beaker, suggesting a struggle. The blood type was A which matched Jenny Cho's, a chemical engineer, and Ralph Nelson's, a college professor. Also present was Asian or African American and Caucasian 
hair, placing Jenny Cho and confirming Ralph Nelson's and Mike Kelly's presence at the scene. Upon looking at Jenny Cho's records we found she had a prior arrest for petty theft in '88. Summation:
Taking into account all the evidence, here's what happened Jenny Cho had been having an affair with Mike Kelly behind Ralph Nelson's back. When Mike proposed to Jenny she decided to leave Ralph. Ralph became angered and wrote Mike a note to lure him out. When they met they fought and during the struggle some of Mike's hair fell out and either Jenny's hair transferred from Ralph or some of Ralph's hair fell out. Also during the struggle Mike dropped the note and his wallet fell out his jacket. Mike then took out a beaker and hit Ralph causing him to bleed. Seeing Ralph unconscious Mike ran away and Jenny Cho came upon Ralph and helped get away, but not before she took the money from Mike wallet.
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