In NYS reckless manslaughter must involve a suspect who saw a risk of serious physical injury or death as a result of his/her actions then chose to disregard the risk and consequently someone was killed (ie. speeding 75 mph past a school at dismissal time, driving plastered etc.) This COULD fly in NYS IF the cyclist was going at a high rate of speed in a crowded area where the risk was great and he/she disregarded the risk. The onus would be on the People to prove it... The law may be very different in the UK.