Since you've been doing this 25 years, I would imagine you've treated approximately 5,000 patients. So out of thousands of mental patients, none have killed themselves?
Three patients killed themselves while under my care.
Two killed themselves while on security watches in psych wards through staff negligence - in both cases the hospitals settled with the surviving families out of court, and since I had thoroughly evaluated and documented the risk and put appropriate orders for suicide watches in place, I was not sued. Both hung themselves in rooms designed to prevent hangings, BTW, and with staff just a few yards away [interesting stories, BTW, but too long to document here].
The third one was an outpatient woman who gave no hint or warning that anything was wrong, and who - despite having a highly-involved case manager and a community outreach team that followed her closely - quietly overdosed at home one night with a highly lethal combination of meds she had researched on the internet.
I had one alcoholic man kill himself shortly after discharge from my care in a hospital where he had been admitted for trying to hang himself while highly intoxicated. He had drank heavily for years, but had no history of depression or previous attempts to kill himself. Once sobered up, he was no longer depressed, nor admitting to any further thoughts of suicide. He complied with setting up an outpatient plan to stay sober, and to get follow up with a counsellor. He was, by the third day, insisting that he be released so he wouldn’t miss more time from work. His insurance, also, would no longer fund him to be in the hospital, and this was in a state in which I had no legal grounds on which to detain him or have him committed. I understood that he presented some risk of another suicide attempt if released at that point, but I had no choice but to document the risk (strictly an exercise in CYA) and allow him to leave. He drank a 5th of vodka and hung himself successfully two days later. The hospital made a compassionate settlement with his mother, which is often done in such cases even though there is almost no chance that any malpractice case would have ever made it to court.
An elderly man with dementia was under my care on a 10th floor psych unit during my residency training. He had been admitted for increasing violence to his wife. I signed the case off to a fellow resident when the rotation was done. The patient managed to disassemble the safety window of his room and jumped to his death a few days later under the other fellow’s care.
One other patient who died under my watch at a mental health clinic was a middle-aged man who presented with psychosis and a severe personality disorder in a setting of heavy stimulant addiction. He had tried suicide many times before, including jumping from a great height one time, which left him hobbled. He lived on the street through petty crimes, and had many enemies. He had recently fractured his leg escaping from a third story psych unit, and had a full leg cast. He was found face down floating in the harbor one day, and it was never determined whether it was suicide, homicide or accident.
I was the last shrink of record - theoretically still the treating physician - for a paranoid schizophrenic patient at a community mental health clinic who, after stopping his meds and getting heavily into meth for a half year, murdered a crisis worker who was sent out to detain him where he lived with and was terrorizing his mother and younger brother. The crisis worker was quite seasoned, and a Green Beret in Vietnam, and knew this patient from back when the patient was on his meds and not using meth, so he foolishly bypassed the usual protocol of having police accompaniment when he went to get the patient. The patient calmly complied, asked if he could go to his room to pack a few cloths for the hospital stay, and then came back out calmly, and began walking towards the front door with the crisis worker, whom he then viciously and mortally stabbed many dozens of times. People who work in mental health, BTW, have much higher rates of job-related morbidity and mortality than LEOs or the military.
Such things happen even to the most careful psychiatrists. I have called the Secret Service on a number of occasions that might have become high-profile cases, and the police even more often. I am very careful, but I also consider myself very lucky so far. Until I know a great deal more about the Aurora case and the patient and psychiatrist involved I would never dream of passing judgement on the doctor, and, knowing how difficult these judgement calls are, I would probably not do so even if I knew much more.