Due to your lack of a physical body, you can phase through physical matter with ease. This can be either walls or people. However, this also means you cannot interact with people because you will just phase through them as well, unless the person you are interacting with has a connection to your death or was a prominent figure in your life.

Due to the trauma of your death, you are able to force your death upon other people. This will make them relive your death however to a much less severity. Depending on your cause of death, it will have a specific type of damage, eg if you were impaled you would deal piercing damage.