Jankiewicz wrote the initial script for Grosse Pointe Blank in 1991 after receiving an invitation to his 10th high school reunion. He picked the film's title, "Grosse Pointe Blank", while substitute teaching for an English class at Upland High School by writing the title on the classroom's whiteboard to see how it would look on a movie theater. Jankiewicz decided to use Grosse Pointe, an upscale Michigan suburb, rather than his working-class hometown of Sterling Heights due to the contrast between the two towns. Jankiewicz simultaneously worked as a substitute teacher and a cashier at a Big Lots before his script was picked up for production. Jankiewicz based many of the characters in Grosse Pointe Blank on real life friends from Michigan and his high school. For example, Jeremy Piven's character, Paul Spericki, was originally named after Jankiewicz's best friend during high school, though the name was changed during filming. An erroneous urban legend emerged under the premise that film's script was based on an actual high school student from Jankiewicz's past who became a professional hit man, which is untrue. The exception was Joan Cusack's character, Marcella, was named for Jankiewicz's manager at Big Lots. Jankiewicz shared the co-writing credits of Grosse Pointe Blank with John Cusack, Steve Pink, and D.V. DeVincentis. In 1997 interview, Cusack stated that he would have liked to film on-location in Jankiewicz's home state of Michigan, but they couldn't move production there due to budgetary constraints. Therefore, Grosse Pointe Blank was primarily shot in Monrovia, California, which substituted for Michigan in the film.
Other projects
After the success of Grosse Pointe Blank, Jankiewicz spent the next fifteen years writing newspaper articles and working as an advertising copywriter. He worked as a "script doctor," editing and improving screenplays written by other screenwriters. In September 2000, Jankiewicz scored his biggest sale with the spec script, "Kung Fu Theater," to Mandalay Pictures. The potential film, which Jankiewicz pitched as a combination of Enter the Dragon and Pleasantville, follows the story of a "slacker" who becomes trapped in a kung fu movie from the 1970s. The comedy was picked up by DreamWorks, with Marlon Wayans and Jamie Foxx attached to star at one point, but remained in development Jankiewicz was finishing a novel at the time of his death. He was also near the completion of a new film script based on the 1961 Goldsboro B-52 crash.
Death
On January 23, 2013, Jankiewicz attended a screening of Grosse Pointe Blank held at his brothers' alma mater, California State University, San Bernardino at the invitation of Professor James C. Kaufman. Kaufman called him that morning to invite him to attend the class that evening. The screening was attended by approximately seventy-five students of Kaufman's "Psychology and the Movies." Jankiewicz collapsed during a question-and-answer session held after the film. He was rushed to Community Hospital of San Bernardino, where he was pronounced dead at 10:51 p.m. at the age of 49. He was a resident of Upland, California.
