I think she probably died very close to noon...when Howard was alone with her. That agrees with Perper and what he said about the drug the Medics gave her.
It looks like the same timeline for Danny's death. He had been dead for a while when they found him. What always bothered me about that death was Anna saying...he's not breathing...and Howard immediately checking his cahrotic (sp) artery for a pulse. He didn't shake him...Hey Danny...Danny..
yes, probably cause HKS KNEW he was dead....just waiting for someone else to find him(mmm strange).....apparently he died quietly...in his sleep?