Sheriff’s Detective Honored for Work on Cheyenne Homicide

Detective Robert Mosbacher of the Laramie County Sheriff's Office was recently recognized by U.S. Attorney Mark Klaassen for his outstanding efforts in the investigation and prosecution of Armando Ramirez-Serna.

Ramirez-Serna was sentenced in February to 40 years in prison for the November 2017 shooting death of 19-year-old Justin Robinson.

Prosecutors say Ramirez-Serna killed Robinson while robbing him of less than four ounces of marijuana and just over $200.

Robinson's body was found in a reservoir on the Wyoming Hereford Ranch.  His burnt SUV was found nearby.

Ramirez-Serna pleaded guilty in October 2018 to interference with commerce by robbery and use and discharge of a firearm during and in relation to a crime of violence causing death as part of a plea agreement.

In exchange for his plea, two other counts were dismissed at sentencing.

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