It has me baffled as well, they either disabled the outside cameras the day before lr earlier in the evening, or knew how to dodge them, so knew the survillence system like the back of their own hand, or the perp is caught on camera but LE is withholding that info for trial, or they had a streak of dumb luck, extremely lucky...not buying it. Somehow they arrived at the church, broke in managed to not drip track, mud and water everywhere or stripped out of a rain slicker stashed it and changed.
They somehow parked out of camer range, or hiked in from another location, or dropped off by a another person.
They must be camera leaving... unless the erp managed to disable cameras for the murder and exit.