It is unclear why you have became obsessed with this particular victim. The most logical explanation is that he reminds you of your children. Perhaps you are projecting your fears of losing your children onto this particular individual. Though this obsession may never be fully understood, in all likelihood, it derives from and thrives on extreme fear.
It is always unhealthy to operate on the basis of fear. Fear cripples our lives. So too can unrealistic thinking. Unrealistic thinking ultimately leads to incorrect conclusions and mistakes in judgment.
You are engaged in unrealistic thinking. You stated that you believe that if you continue to read about this particular victim, he will remain alive. For that to be true, it would mean that you have supernatural powers.
The reality is this: whether you read about him or you don’t read about him, it will have no impact on his life, in any way. It is simply not a realistic idea.
Forcing yourself to believe only what is rational, logical and real would help to reduce or to eliminate your obsession.
If the obsession continues, then I would strongly recommend seeing a psychotherapist. A psychotherapist can analyze what is driving your obsession. What’s most important is learning how to remove this obsession and resume your normal life activities. Please take care.