An Idaho man who has been accused of killing his grandfather with a hatchet told police that it was a mercy killing, according to local reports. Jeremiah Kiley, 29, has been formally charged with the second-degree murder on Monday, January 5, of his grandfather, Joseph Reyes, who was 69. Reports indicate that Kiley waited until Tuesday, January 6, to call 911 to report his grandfather's death. As he spoke to dispatchers over the phone, Kiley allegedly told them that Reyes had been "acting crazy" the previous evening, according to court records obtained by local paper the Bonner County Daily Bee. Deputies with the Bonner County Sheriff's Office rushed to Reyes' Sandpoint home, where they found his lifeless body. It was determined he had been dead for several hours. While speaking with the deputies, Kiley allegedly told them that he killed Reyes with the hatchet in self-defense. He allegedly told investigators that during a "schizophrenic episode" the night before, his grandfather had pointed a gun at him. Kiley further claimed that he feared that Reyes would find more guns that were hidden throughout the home where they both lived, police alleged in the court documents reviewed by the Bonner County Daily Bee. Ohio Man Allegedly Fatally Shoots Roommate, 61, Over Fight About Dog Those same documents indicate Kiley, while admitting to striking his grandfather in the head that prior night with the hatchet, also claimed that the killing was committed to "stop [Reyes'] suffering." The court records failed to account for why Kiley waited until the next day to report the alleged incident. It is alleged in the court records that as they were questioning Kiley, police could see his demeanor shift, moving from calm in one instance to aggressive in the next. Kiley is being held on a $1 million bond. He has not been asked to enter a plea to the charge against him, and it was unclear Thursday, January 8, if he had an attorney who could address the allegations on his behalf. The case is still being investigated, police said in a statement. Kiley has a court hearing scheduled for January 21. Texas Man Reveals the Reason Why He 'Needed' to Kill His Elderly Mother If convicted of second-degree murder, which is defined as involving "malice aforethought" or the use of torture, Kiley could be sentenced to 10 years to life without parole. In Idaho, offenders might face the death penalty if they are charged with first-degree murder. In such cases, the killing had to be carried out "by means of poison, lying in wait, torture," or with premeditated "willful, deliberate" intent. Suspects may also face a first-degree murder charge if they kill "any peace officer, executive officer, officer of the court, fireman, judicial officer," prison guard, "or prosecuting attorney who was acting in the lawful discharge of an official duty." A murder is also a first-degree felony when it is committed "in the perpetration of, or attempt to perpetrate, aggravated battery on a child under 12 years of age, arson, rape, robbery, burglary, kidnapping, mayhem, an act of terrorism, or the use of a weapon of mass destruction, biological weapon, or chemical weapon."