When Tim goes to the genetics lab and activates the hologram you see Dr. Ann Laurent get blown back by Mewtwo during his escape. In slow motion she flies backwards towards a large solid steel circular door about 7 feet in diameter and three feet thick. When the hologram turns off you see its been blown off its hinges. It doesn't show her death but I think its not a stretch that she was reduced to chili on impact.
To be fair though, it was negligent homicide as he saw her in front of his tank but didn't care he was focused on his escape and didn't mean to killl her..... as if did he would have just vaporized the whole place the second his restraints were off