The Band 3 deaths within 26 years

 born on 4/3 in '43...dies on 3/4 of suicide

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 104/14...43/14th prime...dead=14

Kill=64

also born in '43..on a day with 41 numerology..12+29=41

also born with 103 and 58 numerology...

died of

died on 12/10...121

 dead at age 55..on the 10th..55/10th fib/triangular

he's from Ontario as well..Ontario=38,97,43

 died in...

born with 71 numerology, 5+26+40=71..dead at age 71

death=20

Born with 27 numerology..

born on the 26th..died of cancer=26

 death=213

 Robbie Robertson...

born in '43 as well!..also from Ontario on a day with 55 numerology..7+5+43=55
Helm died on a day with 55 numerology..