If you know anything about the slaying of Colo. grad student Andrew Graham, call our hotline right away at 1-800-CRIME-TV.
Andrew Graham is seen leaving the County Line Station light rail platform.
Police say this still image shows one of two couples exiting the platform.
While cops don't consider either couple to be suspects, they would like to know if they saw anything out of the ordinary the night Andrew was murdered.
Authorities say this still image from surveillance cameras show the second of two couples exiting the light rail platform.
They believe the two couples could possibly be the last people to see Andrew alive before he was brutally gunned down.
Police say Andrew Graham seen here exiting the train was in Boulder, Colo. finalizing plans for an apartment with friends.
They say he had planned on starting graduate school in January of 2010.
Cops say they would like to get in touch with one of two couples to see if they saw or heard anything when Andrew Graham was exiting the light rail station.
Cops say one couple is exiting the train while another couple was seen entering the bridge at the County Line light rail station.
They say Andrew Graham can be seen in front of the two pairs mid-way through the bridge.