nicholas figueroa , 23 , killed in gas explosion in the east village last month .
on tuesday , relatives , friends and strangers bid him an emotional farewell .
mr figueroa 's father said family was broken over his ` heartbreaking ' death .
brother paid tribute to ` best friend ' whom he will name his future son after .
and mother , ava , wore button on her jacket featuring mr figueroa 's image .
tear-jerking service held at manhattan 's church of the holy name of jesus .
moises locon , 26 , also died in march 27 blast - and 22 others were injured .