Closing arguments wrapped Monday in the capital murder trial of Ronny Walker, who is accused of killing 14-year-old Nilexia Alexander in 2022. Before arguments started, Judge Robin Fuson made a big reversal, allowing prosecutors to use what’s called "the principal theory." That means even if Walker didn't commit the crime himself, if he helped someone else commit or try to commit the crime, he can be treated as if he committed it himself. This decision worked to the advantage of state prosecutors. The state attorney argued that Nilexia was seen in surveillance video getting in a car with Ronny and another person, Robert Creed, who testified against Walker. The state maintains this was a premeditated killing, but the defense said there’s no evidence showing Walker was the person who pulled the trigger. Both sides agree that Nilexia’s phone may have been in the car after the murder, but the defense argues that wherever the phone went, Robert Creed was also present. “The shots alone is evidence of premeditation, the drive to that location is evidence of premeditated murder, the defendant turning off his lights premeditated first degree murder, the defendant citing someone else being in his vehicle, knowing full well it wasn’t him premeditated first degree murder,” prosecutors Chinwe Fossett said. “First of all, there are three people in this mixture that Ms. Fossett keeps bringing up over and over. Three people. She conveniently left out the third person. Now, is the third person Robert Creed? We don’t know. The DNA expert says he could not tell you that it is or is not him. She can’t include him or exclude him,” defense attorney Maria Dunker said. Robert Creed and another witness testified last Thursday, saying Walker was upset that Nilexia allegedly gave him a sexually transmitted disease. The defense said there’s no evidence that Walker had an STD. Right now, Creed is only being charged with accessory after the fact. He pleaded guilty and will be sentenced this week. Robert Creed Jr. says he saw Ronny Walker kill 14-year-old Nilexia Alexander. Walker's defense says Creed is the real killer. Murder of Nilexia Alexander The investigation began early on May 6, 2022, when Tampa police responded to a 911 call about an unresponsive person in a field. They found Nilexia's body near the road, along with shell casings and a phone charger, but her cell phone was missing. That phone later became key evidence. GPS data showed it had traveled in a dark-colored sedan, later linked to Walker. Surveillance footage captured a vehicle matching that description near the scene with its headlights off shortly before gunfire was detected by ShotSpotter, a gunshot-detection system, according to court documents. The same car was later seen on security cameras at Tampa General Hospital. Inside Walker's black Ford Fusion, investigators found blood traces that DNA testing confirmed belonged to both Nilexia and Walker. A third person who had been in the vehicle was also detected and identified as Robert Creed. Detectives then found surveillance video showing Nilexia getting into Walker's vehicle near his home, just minutes before she was killed. "To take a baby's life, you'd have to be heartless. I would never have the closure of why he took my daughter's life at 14," Ashley Alexander said in an interview on the first anniversary of her daughter's murder.