Charlotte Walker, 36, was fatally shot while riding her bicycle on March 29, 2016, in the 2700 block of Sampson Street in Houston. She was struck by a bullet fired from a distance and died at the scene.

Investigators say the shooter had been on a balcony and used a .22 caliber rifle fitted with a homemade silencer and scope, a detail that police view as indicating a premeditated act. The Houston Police Department Homicide Division opened an investigation; during a later probe into 30-year-old Jamin Stocker, police determined a .22 rifle he bought in 2015 matched the weapon used in Walker’s killing. Stocker remains charged with murder in this case.

Crime Stoppers of Houston has offered a reward and authorities continue to ask anyone with information to come forward. If there is any detail about Walker’s movements that evening or about the shooting that has not been reported, can readers share what they know with investigators?