with plans to continue in the UFC's featherweight division. He was briefly expected to return in April 2016 at UFC 197. However, Penn's return was delayed after an investigation into criminal allegations made against him was launched. In turn, Penn was expected to face Dennis Siver on June 4, 2016, at UFC 199. However, Siver was forced out of the bout in early May with an undisclosed injury. He was replaced by Cole Miller. Subsequently, Penn himself was removed from the card on May 23 after he was flagged for the use of a medically administered IV during a non-fight period, when the use of IV had been recently banned 365 days a year. Penn was expected to face Ricardo Lamas on October 15, 2016, at UFC Fight Night 97. However, on October 4, Penn pulled out of the fight citing an injury. In turn, the promotion announced on October 6 that they had cancelled the event entirely. After three delays in getting his return fight scheduled, Penn returned to the UFC in early 2017. He faced Yair Rodríguez in the main event on January 15, 2017, at UFC Fight Night 103. Penn lost the one-sided fight via TKO in the second round. A rescheduled bout with Dennis Siver took place on June 25, 2017, at UFC Fight Night 112. Penn lost the fight by majority decision. For his next fight, Penn returned to lightweight to face Ryan Hall on December 29, 2018, at UFC 232; it was his third stint in the lightweight division. In preparation for the fight against Hall, Penn returned to train at Nova União. Penn lost the fight via a heel hook submission in the first round. Penn faced Clay Guida on May 11, 2019, at UFC 237. He lost the fight by unanimous decision. On July 26, 2019, news surfaced that Penn was expected to face Nik Lentz in a grudge match, at a UFC event to be determined. However, Penn was released from the promotion in early September after video evidence surfaced showing Penn fighting patrons in a bar brawl in Pahoa, Hawaii. Personal life His nickname "B.J." is a shortened version of another nickname "Baby Jay", which itself derives from the fact that Penn is the youngest of his brothers all named "Jay Dee Penn". B.J.'s father, who is Irish and English, named 3 of his 4 children "Jay Dee", while the