The victim, 31-year-old Samira Siwakoti, was a mother of two young girls.
She was robbed and shot to death at the store she owned with her husband.
At Thursday's workshop, business owners gained tips on how to train for a robbery, and if one happens, what to do during and after the crime to help police catch the criminals.
"Samira went to work just like we did," said business owner Karen McGuffin. "We take it for granted we come home each night."
Police narrowed almost 200 tips down to 50 solid leads in hopes of catching Siwakoti's murderer, generated from the Rapido convenience store's surveillance video.
The suspect is seen setting a bottle on the counter and then pulling a gun from his pocket.
Police say despite Siwakoti obeying his commands, the suspect still shot her in the face, killing her.
Surveillance from the business next door shows the gunman got dropped off in a dark-colored car. Then nearly two minutes later, he runs out of the store after murdering the mother of two.
The Colony police say catching the killer is a top priority, along with taking interest in violent robberies in nearby cities.
"We're looking for anybody that matches the description," said The Colony Police Chief David Coulon. "Any known robbers that are in other agencies that have robbery warrants out."
A 19-year-old was arrested in west Frisco on Thursday afternoon near some homes under construction on charges for a May robbery.
Frisco police say the man they arrested, Deon Kingston, robbed a convenience store in the same manner as Siwakoti's killer, pointing a gun at the clerk, demanding money and even running away on foot.
The Colony police say Kingston is now a person of interest in their murder case.
"He may be ours," said Coulon. "We have a lot of detective work to do, but we are definitely rounding up as many people as we can."