MODJESKA CANYON (CBSLA.com) — As authorities prepare to charge the roommate of an Iraq war vet and Cal State Fullerton student with her murder Tuesday, new details are emerging from the investigation.

The body of 36-year-old Maribel Ramos was found Thursday in a remote area in Modjeska Canyon. Her roommate, 54-year-old K.C. Joy, has been charged in her murder.

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KCAL9’s Michele Gile spoke to the suspect on two separate occasions. He said that police never asked him if he took Maribel somewhere Thursday night.

In the first interview, Joy said that the visible scratches on his left forearm came when he was walking his and Ramos’ small dogs at Eisenhower Park in Orange. He said that the dogs were pulling in opposite directions and he fell into a bush.

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KCAL9 has learned that police did not believe that story.

A source close to the investigation said among other things, homicide detectives have photos of scratches on Joy’s left forearm that they believe were inflicted by a barbed wire fence adjacent to the area where Ramos’s body was discovered last Thursday.

Authorities have not said what led them to the remote part of Modjeska Canyon where her body was found.

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Joy is being held in Orange County jail on $1 million bail.