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US - Houston police say four teens have been accused of killing a homeless man for all the money he had - a dollar.

Capital murder charges were filed Tuesday against Carlos Fernandez, 18, Marilyn Villarreal, 18, and Michael Correa, 17. A 16-year-old girl was held in juvenile custody on a capital murder count.

The body of 32-year-old Pedro Miguel Ramos was discovered April 4 in an alley. Houston police say the victim had been robbed and shot.

According to police reports obtained by CBS Houston, investigators initially thought the killing was over a bicycle or some chicken, but later determined the motive was cash.

Police were able to identify the suspects when days later the 16-year-old was involved in a home invasion.

It was during the interrogation that confessions were made.

"There were some tears, but not for Pedro - for themselves," Det. Fil Waters told KHOU.com.

All suspects are being held in the Harris County Jail without bond.