|Minor Character: Miami|
|Family|| Ivonne Hernandez (ex-girlfriend)|
Elsa Hernandez (daughter with Ivonne)
|Occupation|| Member of the Mala Noche|
Spree Killer (briefly)
|Portrayed By||Robert LaSardo|
Memmo first appears as one of three hitmen targeting Horatio Caine while he is riding with his dying wife. His partners try to kill Horatio but are unsuccessful and as a result his two partners are killed and he flees. He is later revealed to be the killer of Horatio's wife and Eric's sister Marisol Delko. After he is captured, he is taken out in the middle of nowhere and threatened at gunpoint to tell them who put out the hit on Marisol. He eventually confesses that Antonio Riaz ordered the hit and is hauled off to jail.
One of Our Own
He later gives them intel on where to find Riaz and is later sentenced to death for his crimes.
He later broke out of prison along with four other inmates and started a murder spree across the city. He first kills a boat owner named Doug for his gun and jewels. He then goes to see his ex-girlfriend, Ivonne Hernandez, to convince her to let him see his daughter, only to realize that Elsa was taken from her mother and sent into foster care, where she was being abused by the foster mother and the justice system was failing to protect her. He became enraged and traveled to the hospital where he killed two nurses that refused to help his daughter. A policeman showed up and tried to shoot Memmo, only to get shot himself and have his radio and service weapon stolen. He then hitched a ride in a garbage truck to escape undetected. His next target was Elsa's case worker who failed to give Elsa protection, and made him call Horatio and tell him he failed and didn't do his job. Memmo killed him and went to the foster mom's house to get his daughter back only to find her missing. In his anger he shot the foster mom in the leg and told Horatio to find his daughter. He later learned, thanks to his stolen radio, that his daughter was about to be sold to another family. He then steals a taxi confronting the CSI team and kidnaps Kenneth McGuier, Elsa's kidnapper. Memmo tells Elsa that he is going away for a while, and makes his escape because Horatio and Eric couldn't bring themselves to kill him in front of his own daughter. Memmo later killed Kenneth and escaped.
After this Memmo uses one of his old Mala Noche contacts, Cesar Soto, to make a mask for his face, which Cesar presumed was to skip town. But instead Memmo goes to another Mala Noche member, Felix Medina, and convinces him to snitch on the Mala Noche by threatening his son Miguel. Soon after the Mala Noche's operations are shut down Memmo's plan is put into action for the top spot. When Medina is taken in for questioning Memmo kills his lawyer in order for his plan not to be disrupted and to send a message not to talk. Memmo then gets Miguel to be the new snitch calling in a tip about an attack on a local tour bus group. When the CSI Team arrives the Mala Noche opens fire and Memmo takes advantage of the confusion and kills the current leader. He then calls a meeting where he berates the other Mala Noche for putting money before brotherhood and kills one member for trying to blame Salazar. After he takes control he gets a tip that Salazar might still be alive he travels to a boat where Horatio is waiting for him. After a brief struggle Horatio takes his gun away and takes him into custody where he is returned to prison.
He later reappears when a Mala Noche hitman is suspected of targeting a Mexican patrol officer and her family. He gives Horatio intel in exchange for a steak. Unfortunately the Mala Noche bosses find out that Memmo talked and as a punishment, beat and demote him.
As a hitman for the Mala Noche, Memmo would be paid and hired to kill his victims. It is unknown how he killed them, although it can be assumed by how he killed Marisol Delko, he shot them with a rifle. Originally during his killing spree, he would shoot his people connected to his daughter in some way with Doug's handgun. He later went on to kill members of the Mala Noche out of necessity. When he killed Sharon Kirby, he slashed her throat.
- Presumably killed numerous other unnamed victims prior to Rampage
- May 15, 2006: Marisol Delko (sniped)
- October 23, 2010:
- Doug (the boat owner; shot; killed for his gun and jewels)
- The hospital shooting (two casualties):
- Lucy (killed along with Beth for not helping Elsa)
- Rhonda (threatened to shoot her; relented after knowing she wasn't connected to Elsa)
- Unnamed policeman (attempted, but survived; was non-fatally shot and had his radio and gun stolen)
- Aaron Tabar (Elsa's case worker)
- Joanne Connors (Elsa's foster mother; non-fatally shot her in the leg and intentionally let her live)
- Kenneth McGuire (Elsa's abductor)
- February 20, 2011: