Who killed the electric car? Nobody - it's not dead yet, it's still dragging along like it has been for decades. If there was a market that would support electric cars, electric cars would be sold.
Electric cars have been around for as long as I've been driving but have stayed on the fringe because they just don't offer the same value as gas powered cars. GM made the mistake of believing all the hype and rushing into production based on optimistic forecasts and California's ZEV law.