I was bored when I read the news article, so I searched for possible motives. The councilman's colleague that called 911 said that "no amount of pain should drive somebody to violence". There is a photo of the councilman on his social media with the attacker and his wife at a fair and he has reacted with a heart on photos of her with her dog on Facebook, a few days after the attacker and she (married since 2023) allegedly separated.
Seems like a case of infidelity.
CKD patients on dialysis are not used to have urine in their bladder, which has lost its muscle tone and volume because of disuse, so people need to urinate more frequently for a certain time period after their kidney transplant and their nervous system has to be retrained for sensation, contractility and voiding.