The lead investigator in the James Boyd case took the stand Tuesday as the legal battle to decide whether Albuquerque cops will be charged with second-degree murder entered its second day.Expert: Boyd case too close to callAlbuquerque police said Boyd was shot and killed by then-Officer Keith Sandy and Officer Dominique Perez after a tense, three-hour standoff in March 2014. CLICK HERE to see live video from the courtroomFirst on the stand was APD detective Geoff Stone, who investigated the officer-involved shooting.The state started the day by saying the investigation was handled differently than others, and pointed out Stone was a fellow APD officer. Prosecutors suggested Stone gave them special treatment by waiting two days after the shooting interview them, and that he hand-delivered evidence to crime labs.Prosecutors also went after Sandy, addressing controversial banter with a friend that took place prior to the shooting. Stone said Sandy told him he may have said he planned to shoot Boyd in the penis with a Taser shotgun.“I think he, just in his mind, wanted to come fall on a sword, and that’s why he said it,” Stone said.Recordings show Sandy didn’t say it, but did say Boyd was a lunatic.Perez arrived on scene 15 minutes before the shooting. Multiple attempts by other officers to get an armed Boyd to comply, and multiple non-lethal tactics to get him into custody failed.“He pulled … the knives out in both hands, held them at chest level and took a defensive posture,” said Stone.Stone also unsealed several bags of evidence containing Boyd’s belongings. Among those belongings were three knives, an empty Mace can, Bibles, a fanny pack and less than $10. The defense said Boyd threatened to kill police numerous times during the standoff.While he said he wanted to come down the mountain, the defense pointed out that Boyd never put down the knives and did not surrender.Stone was asked about whether Sandy ever mentioned making a mistake while on the repeat offender project, and getting flak from others on the project. Stone said he recalled that.Some involved with the project were on scene the day Boyd was killed.Stone discussed the bullets and fragments recovered from the shooting scene, and the state showed autopsy photos of Boyd, including his amputated arm.MOBILE USERS: Watch the story as it airedOn Monday, each side gave opening statements and police chief Gorden Eden took the stand. Eden said he’s seen video of the shooting once.Proceedings will continue Wednesday.CLICK HERE to see our Day 1 highlights storyRelated Content--Everything you need to Know: The James Boyd Case File--James Boyd case testimony in photos--Preliminary Hearing FAQs--Who’s Who in the James Boyd Case--APD: Crisis intervention officers not assigned to cases