The new movie's previews show Meredith screaming in terror as she is attacked by killers Amanda Knox, Raffaele Sollecito and Rudy Guede.
In one the 21-year-old British student is pinned to the ground and struggles helplessly as she is pawed by Guede and Sollecito.
Dad John said of the film: "Your imagination runs riot as it is about what happened.
"But to actually see it like this is very distressing. The scenes are absolutely horrific.
"It's awful what these film people have done.
"I'm surprised they have gone so far. I was told the original brief of the film was to take it up to the point of the killing but not actually show the killing.
"It's obvious from these pictures they are showing the killing."
Meredith's Mum Arline said she could not bear to watch the previews of Amanda Knox: Murder On Trial In Italy, to be screened on TV on February 21.
She said: "I really don't want to look. It's shocking." John wants the previews withdrawn from internet sites. He said they are not just offensive, but also legally dangerous.
American Knox and Italian boyfriend Sollecito are in the middle of an appeal against convictions for slashing Meredith's throat at a student house in Perugia, Italy.
John added: "I have asked and would hope the pictures are withdrawn from the internet.
"Not only have they upset me and my family but they are also in extreme danger of being sued by the convicted people's lawyers.
"In Italy you are regarded as still not being completely convicted until you have had two appeals. If these people win their appeals, which I hope they won't, then they could sue the makers." Arline said: "I don't understand how a film can be made when there is an appeal to be heard.
"It also brings this all up again for us which is always very hard.
"I said a few months back I didn't understand why the film was called Amanda Knox when my daughter was the victim."
Knox, 20 at the time of the murder, is played in the film by Heroes star Hayden Panettiere.
Panettiere, 21, recently said she did not think it would anger the Kerchers. She added: "The script is really good. I don't think the family will be upset about the way it was put together."
The film goes out on the Lifetime channel in America. The trailer is on various internet sites. It also shows police finding Meredith's body beneath a duvet in her bedroom and Knox and Sollecito in bed together. After a request from the Kerchers, The Sun has not published some of the more graphic images.
Lifetime declined to comment. Meredith, from Coulsdon, Surrey, was found dead in the house she shared with Knox in November 2007. Police said Knox, Sollecito and drug dealer Guede killed her when she snubbed sexual advances.
Sollecito and Knox were jailed for murder for 25 and 26 years respectively.
Guede got 30 years reduced to 16 on appeal.
Knox's lawyer yesterday threatened legal action if the film was released.
In one the 21-year-old British student is pinned to the ground and struggles helplessly as she is pawed by Guede and Sollecito.
Victim ... Meredith Kercher
Jailed ... the real Amanda Knox
Shock ... John Kercher
"It's awful what these film people have done.
"I'm surprised they have gone so far. I was told the original brief of the film was to take it up to the point of the killing but not actually show the killing.
"It's obvious from these pictures they are showing the killing."
Meredith's Mum Arline said she could not bear to watch the previews of Amanda Knox: Murder On Trial In Italy, to be screened on TV on February 21.
She said: "I really don't want to look. It's shocking." John wants the previews withdrawn from internet sites. He said they are not just offensive, but also legally dangerous.
American Knox and Italian boyfriend Sollecito are in the middle of an appeal against convictions for slashing Meredith's throat at a student house in Perugia, Italy.
John added: "I have asked and would hope the pictures are withdrawn from the internet.
"Not only have they upset me and my family but they are also in extreme danger of being sued by the convicted people's lawyers.
Passion ... killer Knox with lover Raffaele Sollecito in film
"It also brings this all up again for us which is always very hard.
Path to murder ... movie scene shows Meredith and Knox out for stroll
Knox, 20 at the time of the murder, is played in the film by Heroes star Hayden Panettiere.
Panettiere, 21, recently said she did not think it would anger the Kerchers. She added: "The script is really good. I don't think the family will be upset about the way it was put together."
Shameless killer ... arrested Knox waves in film
Lifetime declined to comment. Meredith, from Coulsdon, Surrey, was found dead in the house she shared with Knox in November 2007. Police said Knox, Sollecito and drug dealer Guede killed her when she snubbed sexual advances.
Tears ... Knox sobs behind bars in a clip from controversial movie
Guede got 30 years reduced to 16 on appeal.
Knox's lawyer yesterday threatened legal action if the film was released.
