if intruder theory were a medical diagnosis, what would be signs and symptoms?

you go to a doctor, with your complaints.

you list your complaints. one example is complaints like
Confusion or feeling as if in a fog
Dizziness or “seeing stars”
Appearing dazed
Loss of balance and unsteady walking
Temporary loss of consciousness

Doctor offers asks for history and orders tests and arrives at diagnosis of concussion.

A medical sign is an objective[1] indication of some medical fact or characteristic that may be detected by a physician during a physical examination of a patient. For example, whereas paresthesia is a symptom (only the person experiencing it can directly observe their own tingling feeling), erythema is a sign (anyone can confirm that the skin is redder than usual). Symptoms and signs are often nonspecific, but often combinations of them are at least suggestive of certain diagnoses, helping to narrow down what may be wrong. In other cases they are specific even to the point of being pathognomonic.

Diagnosis is the identification of the nature and cause of a certain phenomenon. Diagnosis is used in many different disciplines with variations in the use of logics, analytics, and experience to determine "cause and effect". In systems engineering and computer science, it is typically used to determine the causes of symptoms, mitigations, and solutions.[1]

what are the signs and symptoms of an intruder entering a home and killing a child and leaving behind a written message?

what are the signs and symptoms of a a family member inside the home and killing a child and leaving behind a written message?

does the evidence, including expert witness testimony support a diagnosis of an intruder or a diagnosis of the parents ?

whats the diagnosis?