John and Kevin were known gang members. One night they entered the Stop and Rob on Elm Street. John and Kevin entered the store with the intent to rob it. Libby was working behind the register and when Kevin pulled out a gun she got scared and tried to runaway. Kevin, worried that she would alert the police, fired his gun and killed Libby. What kind of homicide/murder is this?
a. Single
b. Double
c. Triple
d. None of these