Logic Riddle VIP help!!?

A murder took place in Buckingham palace! Prince Charles was killed by an explosion. The next month. Inspector Mario and Luigi came to the scene to investigate but foundønothing useful for the investigation. The palace was totally destroyed and left no evidence whatsoever. However, the servant of the palace testified that Prince Charles had a big fight with one of his 7 mistresses. But she was not able to remember her name or how she looked. She believes that one of them, killed Prince Charles. She also said that, before he died. Prince Charles invited all his mistresses to spend some days with him in the palace.øMario: "Hmmm! The bomb was specifically fabricated to fit in the closet of Prince Charles'øbedroom. This means only one thing: the murderer has definitely been in the palace more than once!øLuigi: "I have questioned all 7 mistresses: Samantha, Miranda, Joanna, Jennifer, Elizabeth,øKinda and Lindsay. Under oath, they all claimed that they've never been to the palace more thanøonce!" Mario: "And did you recorded the time they were in the palace?" Luigi: "Nop! They didn't remember. It's been a long time. However, I asked them who of the other mistresses they met while staying in the palace. The answers were as follows: • Samantha met Miranda, Joanna, Elizabeth and Kinda• Miranda met Samantha, Joanna, Jennifer, Elizabeth and Lindsay• Joanna met Samantha, Miranda and Jennifer• Jennifer met Miranda, Joanna and Elizabeth• Elizabeth met Samantha, Miranda, Jennifer and Lindsay• Lindsay met Miranda, Elizabeth and Kinda• Kinda met Samantha and Lindsay. øAfter hearing these testimonies from Luigi, Mario took a pencil and a piece of paper andøthan 30 seconds he was able to draw a figure that led the answer: Mario found out who was the murderer of Prince Charles. So who is it? Justify