Jason McCubbins, Ray's business partner.
The calendar was the clue to solving this murder. The police realized that since
Mr. Whitcombe was wearing his watch on his right arm, he must have been
left-handed. Realizing that the number on the calendar was written in a hurry and
with his opposite hand, police matched the written number with the months of the
year. So the B was an 8, thereby giving us 7-8-9-10-11: July, August, September,
October, November. Use the first letter of each month and it spells J-A-S-O-N.