In a dramatic re-enactment during closing arguments, Mashburn slipped a black glove onto his right hand and grabbed the knife that authorities identified as the murder weapon, thrusting it down repeatedly to simulate how Katrina Griffin was stabbed.
“She’s doing all she can to fight for her life,” Mashburn told the jury.
The prosecutor then described how Chasity was punched and kicked before being thrown into the closet.
“Her blood is on his jeans, right here,” Mashburn said as he grabbed the leg of Bosse’s blue jeans, which are among the more than 300 pieces of evidence introduced at trial. “This defendant did these things to those people.”
Bosse did not testify in his own defense.
Defense attorney Gary Henry said there is enough uncertainty about the evidence to raise a reasonable doubt that Bosse was present when the victims were killed.
Witnesses testified that a McClain County deputy visited the victims’ mobile home shortly before midnight the day before they died and that Bosse was there at the time. But Henry said Bosse was observed in Oklahoma City the following morning and had been there for several hours when smoke was reported to be rising from the burning mobile home.
“Was he there when the fire started?” Henry asked members of the jury. “I don’t know who was, but I know who wasn’t.
“Shawn Bosse could not have set that fire,” the lawyer said. “Just because it looks bad doesn’t necessarily mean it is bad.”
But Mashburn said evidence presented by prosecutors indicates the interior of the mobile home could have smoldered for hours before smoke began rising from it.
“The timeline doesn’t work at all for him,” Mashburn said.