There are new details about the March disappearance of a Westchester teen in Saratoga Springs. Results from Alexander Grant's autopsy are back, but the case still isn't closed. Our C.J. Spang has more.

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SARATOGA SPRINGS, N.Y. -- "This autopsy report really gives us more questions than answers," said Saratoga County District Attorney Jim Murphy. "It says so much to us with so little information that I think we need to find out more."

The autopsy reveals Alexander Grant had been drinking the night he disappeared. Officials say his blood alcohol content was higher than a 0.16 some point, but the tests found no narcotics in his system, leaving questions as to why Grant behaved so erratically before his death.

"Our goal really is to figure out what exactly happened to Alexander Grant at that party on Church Street in Saratoga Springs," Murphy said. "Why he became incoherent when he was at the medical facility on Church Street. And what led to the circumstances of his disorientation and ultimately leading to his death."

In a statement from the Grant family, they say: "We remain disappointed and disheartened that some of the people involved in this tragedy have not come forward with the information necessary for us to understand what happened to Alex on the night of March 5, 2011. We continue to implore these individuals, and, indeed anyone else who may have pertinent information, to come forward to either us, or to the Saratoga Springs Police with any assistance, however seemingly small, that might be useful to us in our quest for answers."

In an attempt to gather all the facts, Murphy says he's offering immunity to anyone who may have been involved in underage drinking at the party that night - if they come forward with information about Grant's disappearance.

"While certainly we understand that the underage drinking issue is a crime, we are far more interested and far more concerned about what happened to Alexander Grant the hours before he left that party and what happened at that location," Murphy said.

Murphy says Saratoga Springs police do have witnesses to interview in the coming weeks.