"Snap out of it, it's me Michael, remember?!" - Michael Grant, being chased by Leo
Michael Grant was the best friend and co-worker of Daniel Lamb. Just like Danny, Michael worked for The Project and was a high ranking scientist.
Leo Kasper somewhat convinced Danny to call Michael to go fishing just to kidnap him, intending to force Michael to remove the Pickman Bridge. Leo kept Michael as hostage in Blackwell Island, using the Flare Gun from the boat.
It's unknown how, but the Project Militia tracked them down and began to hunt both Leo and Michael, thinking Michael was also a traitor. Michael took advantage of the Militia arrival, grabbed the flare gun from Leo and ran away with boat key.
Leo followed Michael yelling at him to drop the key, but Michael refused. Unfortunately, Leo surrounded and murdered him in order to get the key. Michael Grant died being the only Project member Leo tried to spare, for Danny's sake.
Later, Dr. Whyte revealed the death of Michael in her first therapy session with Daniel, which made him collapse out of sadness. This made Daniel ask Leo if he was really the one who killed Michael, causing the flashback of the level Best Friends during the events of Manhunt 2.
Michael also appeared as a memory of Daniel's murders during Personality Clash and can be either killed or avoided.
In beta versions, rather than a flare gun, Leo used a revolver to coerce Michael as shown in some early screenshots in the official website for Manhunt 2. That's probably because the level Best Friends is an intro for the player to the use of firearms.