Richard P. Macklin is Eddie Corcoran's abusive stepfather and a minor character in the novel It. He is also the stepfather of Dorsey Corcoran, and the husband of Monica Macklin. Like Beverly Marsh's father, Richard would often physically abuse Eddie and Dorsey on a daily basis. However, unlike Al, who would sometimes prove to be a loving father to his daughter, Richard would often severly beat his stepsons without warning. Although not as crazy as Butch Bowers (Henry's father), he still tends to be very violent and psychotic, and often goes above his limits when beating his stepsons (as shown when he forcefully pushes Eddie towards a coat rack, causing to him urinate blood for nearly two weeks, simply because his son had accidentally shut the door, waking his stepdad up)

In May 1958, Richard savagely beat Dorsey with a Scotti recoilless hammer, going as far as killing him. Although struck with grieve over the murder of his son, Macklin covered up the incident, making it look like an accident and buried the hammer in his wife's vegetable garden. When Eddie was killed by It, It framed Richard for the death of his stepson. He was eventually arrested by the Derry State Police about a week later, and sentenced two to ten years in Shawshank State Prison. He was released on 1964, where he had moved to Falmouth. In 1967, Richard committed suicide, leaving behind only a small note which read: "I saw Eddie last night. He was Dead.".