Crash reconstruction detectives are looking for witnesses as the investigation into the fatal crash on Monday near Franconia Road and Gum Street continues. 

During the investigation, detectives learned of a second good Samaritan who helped the injured police officer out of his vehicle. The police want to identify the male teenager with dark hair in order to properly thank him.  

The police are also urging anybody who witnessed the crash and/or took video of the scene before they arrived to come forward. 

If you have any information about the accident or the teenager, please call the Fairfax County Police Department at 703-691-2131 or 703-246-2253.