Can sense death: Yes. Kaneki died once, in MoM only.
Visible cause of death: The cause of death was gored and gutted by another imPort. The imPort is called Juuzou Suzuya and he killed Ken with a scythe; he cut him up in several parts and gored him out. IN FACT, the outcome is posted over the network for everyone to see and it's here
Command level: N/A