(CNN) -- Police have made an arrest in the home invasion slaying last year of a Southern California couple in their beach house, authorities said Monday.

Joshua Graham Packer, 20, of Ventura is facing charges including three counts of murder and two counts of robbery, Capt. Ross Bonfiglio of the Ventura County Sheriff's Department said.

Packer is accused of murdering Brock Husted, his wife, Davina Husted, and her fetus. The Husteds, who were both 42, were stabbed to death in their seaside home in Faria Beach, California, on May 20.

Chief Gary Pentis of the Ventura County Sheriff's Department said it appeared the suspect targeted the victims. "My personal opinion? This was not a random act," Pentis said at a news conference Monday.

Until the couple's slaying, the gated community of luxury homes had not recorded a homicide in 15 years, police said.

According to investigators, the Husteds were home with their two young children on the night of the slaying. Their daughter was asleep in bed, and their son was watching "American Idol" in the living room.

About 10:30 p.m., the suspect entered the home through French doors that face the ocean, police said.

The killer was dressed in dark clothing and wore a motorcycle helmet, authorities said. He walked past the child who was watching television and stabbed the Husteds.

Davina Husted was four months pregnant.

The home was not ransacked, and the alleged murder weapon was left at the scene, Bonfiglio said.

A sample of Packer's DNA taken after an arrest in Santa Barbara matched the genetic material found at the Husted crime scene, said Pentis the sheriff's department chief. He added that items from the victims' house were found at the suspect's home.

Answer the following questions:
1. How many adults were murdered?
2. What were their names?
3. How old were they?
4. On what day did they die?
5. How were they killed?
6. Where were they when they were killed?
7. In what city and state?
8. Has someone been arrested for the crime?
9. Who?
10. What is he charged with?
11. Was anyone else present at the location of the murder?
12. Who?
13. Were they spared?
14. At what time did the murderer come into the house?
15. Was there extensive damage to the home?
16. Was there DNA evidence linking Packer to the crime?
17. What other evidence linked him to the murders?
18. Was the murder weapon found?
19. Where?
20. Do detectives believe it was a random killing?
21. Was crime common in the area?
22. How long had passed since a homicide had occurred?
1. two
2. Brock Husted and Davina Husted
3. 42
4. May 20
5. stabbed to death
6. in their home
7. Faria Beach, California
8. yes
9. Joshua Graham Packer
10. murder and robbery
11. yes
12. two young children
13. yes
14. About 10:30 p.m
15. no
16. yes
17. items from the victims' house were found at the suspect's home
18. yes
19. at the scene
20. no
21. no
22. 15 years