The city Board of Correction will get a new investigator to probe inmate deaths.

Funding for the $86,000-a-year gig was included in Mayor de Blasio’s preliminary budget proposed earlier this month.

Jails have grown more dangerous on de Blasio’s watch, with violent inmate-on-inmate incidents increasing 15.5 percent last fiscal year alone, according to city data. Serious injuries per 1,000 inmates grew to 2.7 in fiscal year 2017, a 50 percent bump from 1.8 three years earlier.

Eleven inmates in custody died of “non-natural” causes between July 2011 and June 2017, according to city data.