  Black holes below Chandrasekhar mass limit (1.4 $M_{\odot}$) can not be
produced via any standard stellar evolution. Recently, gravitational wave
experiments have also discovered unusually low mass black holes whose origin is
yet to be known. We propose a simple yet novel formation mechanism of such low
mass black holes. Non-annihilating particle dark matter, owing to their
interaction with stellar nuclei, can gradually accumulate inside compact stars,
and eventually swallows them to low mass black holes, ordinarily impermissible
by the Chandrasekhar limit. We point out several avenues to test this proposal,
concentrating on the cosmic evolution of the binary merger rates.
