Prosecutors believe a Latino in Philadelphia put heroin and methadone in his infant son's bottle to quiet him but instead killed him, two days before his first birthday

Orlando Rosado will face a third-degree murder trial after waiving his right to a preliminary hearing. Rosado, 45, told police that he accidentally put drugs in the bottle during a 3 a.m. feeding in May 2012. But Assistant District Attorney Lorraine Donnelly plans to argue that the drug mixture - though not baby Christopher's death - was intentional. "He admits putting it in the bottle. His version is, It must have been accidental because he was high," Donnelly said. "My theory is the baby was fussy, and he was trying to put him to sleep." The baby's mother has described Christopher as fussy, and he was at the bottom of the standard weight range for his age, the prosecutor said. Rosado remains in prison after a judge refused to lower his $1 million bail. He had served a year in prison in a 2006 drug case and has prior arrests for robbery and other crimes in New York, Donnelly said. No trial date has been set in the infant's May 11, 2012 death. Rosado is also charged with involuntary manslaughter, drug delivery causing death, child endangerment and other charges. Rosado was in a methadone treatment program for addicts trying to kick heroin but duped the program into thinking he was clean, according to Donnelly. She said that he was using an eye dropper containing someone else's urine for drug tests. Rosado has said that he bought 60 milligrams of heroin and put half in Christopher's bottle, Donnelly said. Police found a significant amount of heroin in both the baby's blood and in the leftover contents of the bottle, she said.