The widow of an Effingham County man shot and killed along with his father in his father's home testified Friday to having an affair with her late husband's brother and said he denied having anything to do with those killings. Robin Rast Heidt told jurors in the murder trial of Craig Heidt that she and Craig had an affair while her late husband Carey was still alive and the affair resumed and continued after Carey was shot and killed. She also denied having any role in the deaths of Philip and Carey and the wounding of Linda Heidt, Philip's wife and Carey's mother.