**Core Concept**
A psychological autopsy is a thorough investigation of a person's mental state and life events that may have led to their death. This process involves gathering and analyzing information from family members, friends, medical professionals, and other relevant individuals to reconstruct the person's mental health history and potential contributing factors to their death.

**Why the Correct Answer is Right**
Psychological autopsy is particularly helpful in cases of suspected suicide or other violent deaths where the deceased person may not have left behind a clear explanation for their actions. By conducting a psychological autopsy, investigators can identify potential risk factors, such as a history of mental illness, substance abuse, or social isolation, that may have contributed to the person's decision to end their life. This information can be crucial in informing prevention strategies and supporting the families of those affected.

**Why Each Wrong Option is Incorrect**
**Option A:** A psychological autopsy is not typically used in cases of natural deaths, such as heart attacks or strokes, where the cause of death is usually more straightforward.
**Option B:** While a psychological autopsy may involve some forensic analysis, it is not a forensic examination in the classical sense, and its primary goal is not to determine the cause of death.
**Option C:** A psychological autopsy may not always be helpful in cases of accidental deaths, such as car accidents or falls, where the cause of death is often more obvious.

**Clinical Pearl / High-Yield Fact**
One key takeaway from psychological autopsy is that many people who die by suicide have a history of mental illness, often undiagnosed or undertreated. This highlights the importance of early detection and treatment of mental health conditions in preventing such tragedies.

**Correct Answer: D. Cases of suspected suicide.