The list of known Tesla coil deaths is as follows:

Henry L Transtrom - Electrocuted while working on a stage and using a
large Tesla coil.  He inadvertently allowed a power arc to go from his body
to some metal framing that was part of the stage backdrop.  He authored the
following book:

 "ELECTRICITY AT HIGH PRESSURES AND FREQUENCIES"
Henry L. Transtrom, originally published: 1913, second edition
1921, Joseph G. Branch Publishing, Chicago; Reprinted 1990, ISBN
1-55918-054-4, Lindsay Publications, Bradley, Illinois, 60915.
Paperback, 247pp, Lindsay # 20544.

1992 - Graduate student intern working at McDonnell Douglas in St. Louis.
A Tesla coil was being used to test aircraft parts against the effects of
lightening.  The person got too close to the tank circuit and either bushed
up against it or a spark left the circuit and struck him.  He never regained
a heartbeat despite excellent CPR and paramedic responses.

March 29,1998 - An unsupervised 14 month old boy wandered into the poorly
made AC line wiring of a Tesla coil.  He was found some time later but
could not be resuscitated.

A master, a bystander, and a small child have been killed by Tesla coils.
It is always a number one priority to keep that list from growing...