“M-Towne: Where Murder Happens” is a narrative podcast companion series to the NBC summer comedy “Trial & Error: Lady, Killer.” Hosted by podcast producer character Nina Rudolph, “M-Towne” parallels the on-air season, exploring juicy details in the murder case of Lavinia Peck-Foster, the honorary matriarch of the small Southern town of East Peck. Parodying podcasts like “Serial,” “M-Towne: Where Murder Happens” pokes fun at all the tropes of the true crime podcast genre in this hilarious, yet bonus-content-rich send-up.