There are indications that car in the parking lot and blazer on chair, belongs to him, but nothing confirming that. Where are his keys,ID? If this things are not belonging to him, whose are?
I agree about meeting timing.
12 copies of meeting agenda in trash plus 7 copies on table near Garret = 19 people. (maybe)
It' necessary to interview people who were on this meeting and determine who was person who was drinking with Ambrose.
He was probably poisoned, i'm waiting autopsy and evidence results.
Little possible, but maybe person who poisoned him didn't know where is kitchen.